Its sleep you want, therefore the place is not important.
See if you can doze off on the sofa or couch. Also don't
change into your regular sleep pyjamas, remain dressed in you
street clothes. You may need to change away from the regular
pattern of sleeplessness. If this works, try establishing
your biological clock.
Else
Check your thoughts. What is running through your mind, when you
want to sleep. Thoughts are basically self conversation and if
thoughts run continously in your mind you can't sleep.
See if you can stop your thoughts, for 5 seconds then 10
seconds, and on and so forth, till you are in
..........dreamland.