If you use an alarm clock, place it so that you can't see the time while you're in bed. Never confuse sex and sleep. Many couples with very different sleep styles feel obligated to share the same bed. Perhaps it's not worth it. Get out of bed.
Many insomniacs stay in bed too long.
If you need seven hours of sleep, but are in bed for nine, you'll toss and turn for two. In one study, Dr. Hauri instructed 62 insomniacs to retire one hour later than usual. Ninety percent reported improved sleep. Never work at falling asleep. Think about something else.