I have lost my snake twice actually. Tho he never escaped from his enclosure, one time i forgot to put the lid back on but in the mourning he was still inside thank god.
The first time i lost him i fel a sleep while i was holding him, i had a bit too much to drink and dossed off (ya ya call me an idiot or whatever i dc) but i found him the next mourning.
The second time it was pretty much the same thing, besides with medication. I was put on new meds for Bipolar disorder, the doc never really told me they made you sleepy but damn, i was out in seconds. On this occasion he was lost for well over a week, finally i found him in a closet that i had already searched 2 or three times, hes a lucky snake to still be alive i guess. Thankfully i live in Florida and the temps are never really a problem in my house.
Now i rarely take my snake out of his cage and make sure the lids on nice and tight. Actually i still hold him for few minutes a day but i dont really sit down and relax with him... too many past problems, too much stress.