it won't wake up!

once my tamagotchi turned into a teenager it sleeps late at nigt and it won't wake up in the morning!

If you can tell me what type of tamagotchi you have, I might be able to help. Don't know? Here is a Version 3 Character Chart!

~Rey Mysterio~ <_<

First, check that the time is set correctly.

Secondly, some characters are like that; staying up late at night, and sleeping in late in the morning. If you want, you can adjust the clock by an hour or two, in your favour; time-shift your Tamagotchi. So, if it's going to bed at 11PM and waking up at 10AM, you can set it's clock to 1 hour ahead of real time to better synchronise it with you. (For example, if it's currently 3PM, set your Tamagotchi's clock to 4PM.)

Yes it is perfectly natural for nearly all tama-teens to do this! <_<