Hi sarg, I know exactly what you mean as this has happened to me several times from my experience I would say you may need to lower your 24 hour insulin, I take levemir at night and when I found I was doing this and my blood sugars were fine I lowered my insulin level by 2 units and found it eventually stopped, id ring your consultant to see if this would be suitable for you to try, hope this helps - good luck !
The only times I have woken drenched (and often shivering as I get cold with all that sweat) is after a nasty night hypo…and when I say drenched - you could almost wring my PJs yuk! Hope you get it sorted, definitely check for lows at night.