GO TO BED!
You’re falling asleep. There are only so many hours a day and you are going to have to get used to not being able to get everything done you want in a 24 hour period. It’s OOooo… KKKkkkk…
You’re tired. Listen to your body and GO! NOW!
Oh! and you were right. New job was a great decision. Trust your instinct. You’ll be fine.