A number of ways to sleep:
1/ Jerk off/sex, good lethargy after that explosive release.
Advice; don't fall asleep on girlfriend.
2/ A double Whiskey.
Advice; this can be increased to further doubles if required.
3/ A long hot bath.
Advice; when combined with #2 will increase likelihood of sleep.
4/ If you are in bed and cannot sleep; don't get up and make yourself a cup of tea, it contains caffeine; do not have a clock by your bed, checking the time a hundred times a night only keeps you awake.
Dr Grm.