I use Ambien, but often take only 1/4 of a 10mg. I've gotten good with a pill cutter to divide the things into 4 pieces. Sometimes a very small dose can do 'enough' without rendering me fuzzy-headed.

If Tom really needs sleep help, confer with docs about several alternatives... (maybe you have already).

For short term use.... or once a week or so, Temazpam (Restoril) can give a 'gentle' relief.

disclaimer: I am fortunate to have most chemicals work on me exactly as they are supposed to, with few side effects beyond a little dry mouth.YMMV