When i first was diagnosed with a mental illness, i was awake all night. i had to learn how to sleep during the daytime, then after i got out of the hospital, i went back to my old way. again bcause of other hospital stays, i learned i had to stay awake during the day to get what i needed like showers and meals at set times. i did read a book called Peak Learning that suggested some of us do stay awake into the weee hours of the morning and said that would be the best time for a person like that to study and do schoolwork, or even a job.