That first day, it seems fine. You wake up all right, you move around, shower, do some laundry, anything to feel refreshed. Like you were never on a long flight. Things are fine. You cook, you play that video game again, even try your hand at some cooking. Then out of nowhere, you're passed out on the couch, asleep, until 1 A.M. Then up for a few hours, and asleep again early in the morning.
Jet lag is weird. You think you've got it under control, but then it sneaks up on you, and you can't get yourself out of it. All you can do is sit and wait for it to go away. Fight the sleep when it comes in, an hope that your sleep patterns get back to normal by Friday. Why? Cause I'm only home for a very short time.