I wear a Forerunner 735xt, time for anecdata!

It may be bigger than a band but it's surprisingly small and very light to the feel, I barely notice the difference with the Fitbit Charge HR 2 I owned before. Major reason why I'm not upgrading to a Fenix of something like that.

Plus up to 15 days on battery when not using GPS, much more if I disable continuous HR.

Personal preference but I find the Venu so light that it does not bother me for sleep the way my Fossil Explorist did (which also never had enough battery to do overnight tracking!)