If you stay regularly at hotels I would think this is a given. I have been a regular hotel stayer for about 10 years now and have had 2 middle-of-the-night fire alarms, both false, thank goodness.
It's a pain and I do see your point, you're paying for a room and a bed, not to stand around on concrete, which you could do for free, anywhere. Having said that, this is one of the vicissitudes of life, a sh*t happens moment. Fire alarms mean less guests die in hotel fires. False alarms are the price we pay for living instead of frying.
I wouldn't have dreamt of claiming against the hotel on either occasion, though I know several tried to get a few quid off the bill. I hope they were unsuccessful.