Tamagotchis can wake up at different times depending on how good the character is.
They wake up at:
- 8am
- 9am
- 10am
If yours is a baby, it will sleep for five minutes, and then wake up.
If you have a character that is NOT a baby, you can fastforward the time to 10am by going into clock mode (pressing , then pressing a + c and using a and b to set the new time.
Should work (fastforwarding with babies doesnt though)