[gwbas1c]

I once drank a 2-liter bottle of Mountain Dew, and then fell asleep about 2-3 hours later.

A few hours later, (about 6 after drinking all of the Mountain Dew,) I pooped. As everything moved in my insides, the caffeine finally hit me all at once.

So it's completely possible for a sleeping pill to sit in Well's stomach for a few hours before he finally absorbed it. I wouldn't attribute any malintent on his part here.