My routine when faced with this. Assume a 10PM to 0800AM "shift" for the below example. Awake entire shift

1. ONLY coffee is at beginning of shift. No other coffee

2. Lots of water all shift

3. NO naps during shift

4. At end of shift, go for a 30-45 minute walk, around hotel, treadmill, etc. Light breakfast at hotel, mostly proteins. Not too heavy on juices as you will be pee-ing due to sugars etc

5. Take a hot/warm shower. Before getting into shower, take 1MG melatonin. Use Office Depot clips to shut the curtains tight in the hotel room. Try to get a room favorable to lack of sun for your sleeping. Go Pee

6. Put room AC on slightly chilly, 65F is good. Pee

7. Read paper, E-Books, etc while in bed and you will fall asleep ASAP. Pee one more time.

my two cents

** depending on work schedule, if I see this shift coming up, the a day or two before I will stay up 24 hours (or close to it), in order to "reset my clock". Then I get on that sleep pattern.