Can't sleep?

I think your mum is under stress condition. Perhaps, you should encourage your mum to learn Yoga, can give it a try.

Your mom should start shaking legs doing nothing from today onwards, so you and your siblings, time to do something back.

Ask her to go for morning walk, do yoga (or anything similar, tai chi and etc). There is a field nearby my house, alot of aunties and uncles, most of them are retiree, go there to do some chinese tai chi, it really helps.