Troubles Staying Asleep

Patient: For about the last year I have been having serious troubles with sleeping. Getting to sleep isn’t the problem, but staying asleep. Every night I will awake at 2 or 3am in the morning and not be able to return to sleep. I used to be able to just read a magazine to fall back asleep, but it no longer works; nothing seems to work.And I don’t believe it is stress, as my mind is clear, and everything seems fine in my life. Whatever it is, my younger brother and gramdpa suffer from the same problem.I hope you have some answers