I couldn't sleep for more than three hours for years.  My current Dr.  prescribed ,  trazadone.  It's a very good pill that is very cheap with little side effects.   It helps me every night ,  and I've taken it for 6 years.  I used to get up    and clean the house and sweep at night.  Hubby can sleep through anything.  

  It wasn't working for me.  I was never alert,  and had trouble during the day.  He prescribed this pill,  and that was such a change for me,  and hubby. If staying up at night starts to cause you trouble,  you may want to talk to your Dr.   My dad never slept for more than 3 or 4 hours.  I think those things may be passed down to family members.