If you’ve travelled by plane for more than a few hours, you’re probably one of the more than 90% of all air travellers who have suffered the effects of jet lag. Business travellers find they underperform for the first day or two after travel. Vacationers complain they don’t feel up to enjoying the sights for at least a day while their bodies recover.
Sleep masks are used at home, in a hotel, or while travelling as a passenger in a car, train, or airplane to block out either natural light (sunlight) or artificial light. Night shifters use them to sleep during the day and patients in hospitals use them to block out light emitting from the hallway. Others use them simply to relax or meditate or block the light when their partner is reading in bed.