back when i was growin and had an endless supply i smoked all day cept for at work which in my case woulda been dangerous.
Soon as i got home it was tidy up get undressed (construction clothes) grab a drink of milk and hit the pipe or joint whatever.
And yes smoked a nice one before bed everynight.
BUT..there was the odd occation that it fucked with my sleep ,seemed i thought to much or sumthin,or was basically to high,,
Of course yer talkin about a chronic insomniac.
I also was one of those guys that everytime i woke up i would take another puff on the pipe.
As far as wasteing it by useing it as a sleep aid, i say nope it was great and couldnt go to bed without haven a nice toke...