Is she actually seeping, or is she trying to sleep and maybe has jumpy legs? If she has trouble sleeping sometimes, for adults, 400 to 600 mg of magnesium before bed will allow a person to sleep and if it is restless legs she might try potassium caplets. I don't know the mg. but the amount of the mdr is 3% each. I take two if i need them at night, if after stretching my back muscles doesn't work. If this isn't her problem, in the old days the parents would put a board between the two sleepers, usually a boy and a girl. I suspect that it didn't always work to keep an amorous couple apart.