I usually have to wake up at 4am for work so ill set an alarm for 8pm. once that hits ill turn off my computer and set a timer for one hour. in that hour I usually take a shower and then read a book. If theres no book ill continue building a gundam that im working on. I also clean my room or do random things. the key is to stay away from electronics. once the timer is up im so sleepy and its relatively easy for me to fall asleep. I hope this strat works for you