I need a how-to on how to get to sleep

My insomnia has gotten bad again.  I'm on anti-epileptics that should make me sleep like a log.  But I'm struggling to get to sleep at decent hours.  Then when I've finally been up long enough to cause exhaustion I need to sleep ridiculous spans to catch up.  I'm trying to force a structured routine to make my body tire naturally but so far no luck.  But then I only have just managed to start getting a little more activity in without risking seizures. Beginning to feel like by the time I'm full recovered from the first op the surgeons will be cutting in to resect the tumour again.  On the bright side, the tumor may just shift away from the section of my brain that controls the movement of my right leg.  So I may get to keep they movement of the limb.