Hang in there Csaw. Don't cave. You can do it. I was just reading something about sleep. They recommended some light carbs (like crackers) with maybe some milk. Sometimes I drink Sleepytime tea. Actually, during my first couple of days, I would drink Sleepytime tea in the daytime. Seemed to help with anxiety. Can you read until you get sleepy? You're doing SO GOOD! Soon you'll have another day.
PS - I have a hard time sleeping. My doctor advised to not watch TV or use a computer immediately before bed as the screen light stimulates the brain. Don't know how true that is, since I still watch TV and/or use the computer, but it might help you.