insomnia
"I have occasional sleeping problems such linked to stress, such as not being able to fall asleep for around 2 to 5 hours or waking up in the middle of night and not being able to fall asleep afterwards. Someone recommended me to try Nustasium  (diphenhydramine). It kicked in after 30 minutes to 1 hour I took it and it helped me sleep without waking up till morning for as many as 8-9 hours. However I felt dizzy and sleepy in the mornings. And in cases when I slept more than 8 hours like at the weekend I felt very weak and dizzy the whole day. Might be good for occasional use when I know I need long hours of sleep as with it I don't wake up early, but certainly not for continuous use, at least for me."