ngẫu nhiên nighttime cramps?

IDK but bạn should have that checked bởi a doctor hoặc proffessional......not ask people on fanpop....juss saying.

there is only one possible reason for this:
bạn had a cramp.

It could be due to any of these factors
1. bạn are beginning your period again due to bạn using a contraceptive that screws it up, such as the pill, coil hoặc implant
2. bạn are needing to release your bowels either diarrhoea hoặc your constipated
3. bạn have been doing a strenuous activity pulling on your stomach muscles such as heavy lifting, stomach crunches etc
4. bạn have eaten hoặc drunk something funny
5. bạn have drunk too much coffee hoặc cola which can lead to temporary diarrhoea
6. anxiety - when someone is scared/worried etc it can also lead to having stomach cramps

If any of these are a factor i'd act accordingly, if not and it persists for 48 hours hoặc more, taking in water, the i would advise bạn go to your doctor.

I dont what to do about that so I would just ask a doctor hoặc your parents if bạn havent already

Growing pains, maybe? I had a problem just like that recently.