you should definatly report the tremor to his neuro.
is it a action tremor or when hes at rest?
what sleep meds is he taking?
i take zopiclone,have done for some years with no problems.
it all depends on the type of sleep meds,some are just to send you off to sleep while others have a more long term effect to keep you asleep.
i think its valium and other antidepressant drugs they use to help you sleep for longer.
these are called benzodiazepines drugs and include diazepam,lorazepam,oxazepam.
zopiclone just send you off,since stopping my amitrptyline anti depressants that i took on a night the sleep med is not as effective.
please tell his neuro or gp about the tremor as soon as you can.