I've been trying this over the years but unless I'm completely comfortable I'm unable to fall asleep. This means perfect position (tossing over for hour or more

I've been trying this over the years but unless I'm completely comfortable I'm unable to fall asleep. This means perfect position (tossing over for hour or more in new unfamiliar bed), perfect hydration (no need to drink or pee) and perfect sound (rain is ok, for ticking clock in another room I eventually give up and go take out the batteries).