Well only if you feel sweaty or smelly. If you have clean underwear on and you have only lay in bed through the night then you should not need to change again. If you have plenty of underwear then change it as often as you like but at least daily.
If it's dirty and gross.
Yes. You should wear underwear!!
Called a wet dream, your already there. if your a girl though, you should probably seek help.
You should start by wearing hers.
You should change your underwear every day because it promotes good hygiene and also if your underwear is dirty it can irritate your sensitive skin in your pubic area.
A 10 year old boy should wear underwear to school and everywhere else. Underwear serves as protection.
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Wear pants over top of the underwear.
It depends on what time you have to get up in the morning; but you should try for 8 hours of sleep at night. b4 theyre kids LOL
It will not harm you, doctors say you should wear loose underwear to increase your sperm.
Under your clothes
Yes they wear underware they have different matrieals probably duhh they arent any different then us they are just Ike people in the states we should wear underware to
You may have a strain in your lat. You should talk to your doctor about possible remedies to ensure that the pain doesn't get bad.