Be careful, they are addictive! I started with one a month and ended up
having to take one a night! This took 4-5 years to get to. What I realized was that the more I took them the more tired I felt. Even though I slept for 8 hours every time I took them.
The side effects started creeping up on me without me realizing what was happening.
Once I figured out that my tiredness was actually made worst from the tablets I stopped taking them. It took me 2 weeks to recover an ability to go to sleep without having to take them. Imidiatly felt more alert and rested.
Now days if I don't get enough rest I put in a fatigue ASR with the roster details and call in sick.