Fit during the night

thanks to the proven effective

Propeaq shiftwork glasses

Learn how to get fit during your shift in the video below.

If they benefit, why not you?

"Besides the fact that the shiftwork glasses keep me awake and alert, I also find it very convenient that their app tells me when to put the glasses on for 30 minutes. Ideal!"


Jeroen Bosch Ziekenhuis

"I do like having one of those shiftwork glasses that 'wakes me up' when I'm called in," he said.


Safetyregion NHN

"Super glasses, finally no more tired during my night shift. And sleeping well during the day. Highly recommended!"



“I can handle night shifts quite well, because I always sleep well and stay awake at night easily. The main advantage of the light glasses for me during my night shift is that I have less need for unhealthy food, coffee and energy drinks. ”:


ICU, Elisabeth Two-Cities Hospital

Why does that blue light actually work? And do I have to work all night with those shiftwork glasses on?

Anyone who does night work, which means working irregular shifts, knows the dip: the moment when sleep threatens to strike while you’re still on the job. Our internal clock produces that sleepy feeling under the influence of the day and night cycle. Daylight wakes and keeps us awake, when night falls the body prepares for sleep. When the outside temperature is at its lowest, human energy also reaches its lowest point. That is the moment of deep sleep. This is how our biological clock has been programmed since prehistoric times. Yet staying alert and energetic during night work is possible with Propeaq’s night shift glasses. You do not have to use it all working hours: Wearing for 30 minutes with the blue light switched on is sufficient to stay ahead of the dip. It works like this: the blue light looks like an extra sunrise to your senses. Your body responds by temporarily stopping the production of the sleep hormone melatonin. You can then perform at level for a few hours, as long as you have used the blue light before you feel the dip.

"Use the night shift glasses according to the prescribed method and you will notice the difference. Using the night shift glasses one time and not the next is not helpful."

And how do those orange glasses work?

If you come home tired from work after the night shift, your body can get another energy boost as the day dawns and the sun rises. That is of course not the intention. That’s why Propeaq’s night shift glasses have another feature: swap the light blue lenses for the orange ones provided when you’re at home. Keep them on for 30 minutes, half an hour, while you relax in your own environment. The red glasses block all natural and artificial blue light from your environment, stimulate the production of melatonin and thus provide the desired sleepiness.

How do I know when to do what?

Propeaq’s night shift glasses support the energy, mood and health of anyone working irregular shifts. The free Propeaq TimeTooler app creates the right personal use times for morning, intermediate, evening and night shifts. With successive night shifts, the moment to use blue light shifts. A strict and personal schedule helps with the transition from consecutive night shifts to a normal day rhythm.

Download our free whitepaper
"Healthy working at night"

The free white paper contains lots of information on what measures you can take to make the night shift healthier and less demanding.

The following experts, among others, contributed to the creation of this white paper:

Prof.dr. Bert van der Horst – Chronobiologist

Sonja Smits – Labor expert, night work expert

Elly Kaldenberg – Nutritionist focusing on night shift

Toine Schoutens – Expert healthy light and Chrono coach

Kasper Jansen – Sports physician, recovery specialist, author The Powernapparadox

Enter your contact information and press submit. You will receive an email with the download link for the whitepaper.

Chrono Eyewear BV uses the data you provide on this form for news updates about Propeaq’s field and products. You can change your mind at any time by clicking the “unsubscribe” link in the footer of any email you receive from us, or by contacting us at [email protected].

"I myself did not benefit that much, but my colleagues definitely noticed a difference."

Asphalt crew

Heijmans Infrastructure

"I can not live without"


PACU, Erasmus MC

"we sleep better and we suffer less from that dip, nice thing those glasses"

Amber & Veronique

ER, Antonius Hospital

"blue with blue, ideal glasses. Keep me sharp during the rough hours in the middle of the night"


Law enforcement


"Healthy and fit through the night shift"

Night shift is top sport. At times when everyone else is asleep and night workers/night shift workers are actually supposed to be asleep, performance is expected of them that is unnatural. Top athletes are actually expected to do the same. Top athletes therefore pay close attention to their recovery, their sleep, their nutrition, their physicality, etc. This workshop shares knowledge and gives advice on how a night worker can also play top sports and work night shifts in a healthier way. Practical tips and tools are provided to ensure that participants can perform healthier, fitter and more alert during their night shifts and recover faster after the night shift. The scientific knowledge covered in an interactive and understandable way is from chronobiology, somnology, nutrition and light therapy.

The workshop lasts about 90 minutes.

Information request

Request information about the night shift workshop using this form

Surely you also want to make your night shift a lot more bearable?

Yes please, send me more information here
or click on the button below to immediately schedule a no-obligation appointment

More than 1,000 people who work night shifts at the following organizations suffer less from the dip and sleep better.

The Propeaq shiftwork glasses are regularly in the media

(click on the article for full story)

Download the free My Propeaq TimeTooler App.

Optimal effect of Propeaq night shift glasses requires planning. To maximize the effect of our light glasses and different lenses, we have developed a special app for specific applications. World travelers can combat or prevent jet lag with the app. Night workers receive a personalized schedule via the app for optimal adjustments to the various night shifts and rosters. In Google Play or App Store, search for My Propeaq TimeTooler. This is free to use, even if you do not have Propeaq light glasses in your possession. Scan the QR codes below for an instant download.

Below some screenshots of the Propeaq TimeTooler app with 4 night shifts

The table below illustrates how Propeaq shiftwork glasses can be used during different night shifts.


Work Times

30 minutes of blue light

at chrono type: early

Orange glasses

1 night shift

Start of service at 11 p.m.

End of shift at 07:00 a.m.

Between 00:00 a.m. and 02:00 a.m.

Upon returning home

30 minutes before going to bed

2 night shifts to consecutive

Start of service at 11 p.m.

End of shift at 07:00 a.m.

Between 01:00 a.m. and 03:00 a.m.

Upon returning home

30 minutes before going to bed

3 night shifts to consecutive

Start of service at 11 p.m.

End of shift at 07:00 a.m.

Between 02:00 a.m. and 04:00 a.m.

Upon returning home

30 minutes before going to bed

Evening service

Start of service at 3 p.m.

End of service at 11:00 p.m.

Between 7 p.m. and 9 p.m.

Upon returning home

30 minutes before going to bed

Morning service

Start shift at 7:00 a.m.

End of service at 3 p.m.

Immediately after getting up and possibly

between 1 p.m. and 3 p.m.

30 minutes before going to bed

Note: After the last night shift, do not go to sleep immediately, but only for a few hours between 10:30 and 14:00, followed by 30 minutes of light. Instead of 30 min, you can use blue light for example 2×15 min. 3 or 4x 15 min is also allowed. Only use blue light in combination with the light blue lenses.

Did you have a short night or do you need a power nap in the afternoon? The light glasses are also a suitable aid to maintain energy and mood. Remember blue light to stay awake and orange glasses to help you fall asleep. The gratus Propeaq TimeTooler app indicates exactly when it is time to wear the glasses and which glasses are needed.

How exactly does light work on our biorhythm

NTR Focus (NPO) - Broken through the night

Science journalist Diederik Jekel in conversation with Roelof Hut (Chronobiolog of the UMCG and visiting the Jeroen Bosch Hospital where Propeaq light glasses are discussed with Astrid Salet (Intensivist) and Jo van Bussel (Head of Intensive Care)


Propeaq’s blue light has a wavelength of 468 nanometers at an intensity of only 35 lux. The LEDs are just over half an inch (1.5cm) from the eyes and are harmless* for normal use. The LEDs are located 1.5 cm from the eye and are harmless in normal use *. 1 x 30 minutes of blue light per 24 hours is often sufficient. The light glasses do not have to be worn continuously for a long time. For those already wearing glasses, there are solutions with nose clip glasses from Nooz optics or even prescription lenses. Through a close collaboration with a renowned international manufacturer of eyeglass lenses, Propeaq glasses are also available in prescription form from your own optician.

* In case of diseases of the retina, for example macular degeneration, we recommend using the light glasses. Insufficient research has been done into possible damage in these situations.

“Night work disrupts biorhythm: keep the damage limited!”

“Night work disrupts biorhythm: keep the damage limited!” Working at night is bad for health and the ability to concentrate. However, a pilot in the Jeroen Bosch Hospital shows ways to limit these adverse effects. Take a power nap, for example, or put on some blue glasses.

Integrated approach to night shift problems

The Intensive Care Unit (IC) of the Jeroen Bosch Hospital (JBZ) completed the ‘Fit through the night’ project at the end of 2018. The insights have now been translated into policy at the department. The JHA project is explained in a shortened version of the NTR broadcast “Nachtwerk”. The integrated approach to reduce the adverse health consequences of night shifts appears to be a step in the right direction. Employees feel fitter than before the introduction of the new policy. A policy that rests on four core pillars: light therapy, healthy nutrition, power nap and roasting.

The promising results were published in the summer of 2020:


In addition to shifting the biological clock with light therapy, a power nap is a very effective way to get new energy. Many hospitals, including the Jeroen Bosch Hospital, Zuyderland Hospital and VU Amsterdam use two options for this purpose; a power nap pod that wraps around the user and with soothing music or a massage chair that provides a “zen moment. A power nap always lasts a maximum of 20 minutes, not longer. You then remain in the falling asleep phase. During this phase, the sleep pressure hormone adenosine decreases significantly. Once awakened from the power nap, you feel reborn. If you sleep longer than 20 minutes, you soon enter the very deep sleep phase. Waking up in the very deep sleep phase is disastrous; you feel broke and “groggy. Staying longer is tempting, but certainly not desirable. If it does happen, complete a full 90-minute sleep cycle so that you wake up in the REM sleep phase.

Collaboration with BOOZTR

As an industry leader, makes a positive contribution to well-being by deploying innovative rest and recovery solutions. The carefully chosen products guarantee effective recovery in 20 minutes.

Thanks to its extensive portfolio, BOOZTR offers a one-stop-shop experience. From power nap pods to massage chairs, from toolkits to consulting. Simply everything under one roof. Products and services that are closely matched are bundled into one powerful intervention.

Customers of BOOZTR operate in healthcare, education, industry, sports, shared workspace, among others. For example, BOOZTR can count Nationale Nederlanden, Leiden University Medical Center, VU Amsterdam, Abbott and Feyenoord among its clients. Visit or call 0800-POWERNAP (0800-76937627).

Healthy food

Night shift employees tend to eat the wrong thing. The human metabolism is different at night than during the day. The kitchen prepares special meals for the night workers. These contain protein-rich, low-carbohydrate food with the correct fats. Think of vegetables, fruits and nuts, combined with fish if necessary. Employees experience less stomach pain or intestinal complaints. The long-term effect is mainly less chance of weight gain.

App 'Good night'

Being fit during the night shift is important for the quality of care and the health and sustainable employability of employees. To help staff stay healthy and fit during night shifts, StAZ has developed the app ‘Goedenacht’ together with SoFoKleS (the Social Fund for the Knowledge Sector). This free app is full of practical information and tips for staying vital and healthy during the night shift in a hospital. The app contains useful tips, facts and tools. The ‘Survival kit’ contains recipes from a dietitian that you can rate with stars. In ‘Test yourself’ you will find facts and fables about working at night and with the pedometer you can discover whether you are moving enough. The app is suitable for the operating systems iOS and Android and can be downloaded for free in the Apple App Store and on Google Play .

Flexible roasting

Nurses can largely create their own schedule. The result of flexible scheduling is faster achievement of responsible planning and greater employee satisfaction than before.

Surely you also want to make your night shift a lot more bearable?

Yes please, send me more information here
or click on the button below to immediately schedule a no-obligation appointment
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