TCA's
 

Yep,
it certainly does interfere with sleep. I think I sort of collapse from exhaustion for about 4 hours if I'm really lucky - even with sleeping pills.
At best I get one night of six hours a month but it is not quality sleep.

Oh Boy does this effect how you deal with the RSD. The other problem is that just about every med we have to take (I know we have no choice) relax the soft palate and you snore / suffer apneoa so the quality of the sleep is poor.

On the subject of TCA's (tricyclic antidepressants) absolutely - constant use.
Some docs prescribe them to stop the tremors but their effect is pretty poor -but it works for some fortunate folk. They only use low doses too for this.

I don't need to back up the great info provided so far about the dangers of p.r.n. (as required) use of these meds.

Cheers
Auberon