I can't imagine why anyone would not sleep with a humidifier overhead. Until last winter I did not, but my life has changed since my teardrop-shaped Crane Cool Mist Humidifier (£33) arrived. Changed for the better.
It's simple to use. No frills. All you do is turn its dial around clockwise and a jet stream of odorless steam puffs up and out, humidifying the air you breathe, so your nose doesn't get dry or your throat scratchy.
Sleeping with this humidifier at night is like sleeping in a bedroom-flavoured rainforest. Mine is orange, but the experience is no doubt just as lovely with any of its other candy-coloured models. [Amazon]