This differs per person and is genetically determined. In general, it is recommended to wear the sleeping glasses for about one hour before bedtime. If you experience relatively serious sleeping problems, it is recommended to use the glasses a bit longer: approximately 1.5 hours before bedtime. This will simulate the natural sunset. Relatively good sleepers can already benefit from the glasses when using them 20 to 30 minutes before bedtime. Genetic evidence has shown that, some people are more prone to the potential negative effects blue light in the evening and thus the potential benefits of blocking it using the glasses.  

No, you can take off the glasses after you have switched off the lights in your bedroom.

Yes, you can still use your electronics. The blue light filter makes you perceive your environment with an orange glow. You will get used to this quite quickly. However, please note when using the sleeping glasses, try to avoid using electronic devices before going to bed. It keeps the brain active and reduces the quality of sleep. Try to do some relaxing activities before going to bed such as listening to music or reading a book. Also, we advise you not to bring your phone to the bedroom. If you do keep your phone in the bedroom, put it in airplane mode.

No! We strongly advice against using the sleeping glasses when partaking in traffic. The use of the glasses can make you feel drowsy, which can put your and the safety of other in jeopardy. When making use of public transport, for instance after a night shift, we do recommend to use the glasses. 

The use of a blue-light filter such as F.Lux will only partially help you. Studies have shown that for more than 95% of people normal room lighting is sufficient to nearly completely suppress the production of the night hormone melatonin. The blue-light filters do work if they are used in a dark room.

The receptors in your eyes that are sensitive to the blue light and are connected to your biological clock the so called ‘Melanopsin sensitive ganglion cells’ are located in the periphery of your field of vision. To be effective, the glasses have to block the light from the sides and top. Normal 'trendy' sunglasses often only protect the center of your visual field which is not sufficient. See here what can happen if you do not shield the artifical light from the top.

Both models filter at least 95% of the blue light. The SB-F2 is slightly more expensive than the SB-F1 and filters 98%. The SB-1 filters 95% of the blue spectrum. Both models attenuate the blue light with over a factor of 20.  This is more than enough to allow melatonin to rise in the evening and night. Both models have a universal design in size for adults. The temples of the SB-F2 can be adjusted in length and those of the SB-F1 cannot. On the product pages of the glasses, you can find the dimensions and other details.

Only partially. The use of sleeping glasses in the evening / night prevents the suppressing the secretion of the night hormone melatonin due to (artificial) light. If you work one or two nightshifts and you have to sleep during the day, your biological clock is still in 'day mode' when you are trying to catch up sleep during the day. Your body normally does not secrete melatonin during the day. Because of this the sleeping glasses can only partially help in this process.