mostly, for me, it's just been a simple matter of convenience (being off work and just lolling about), but it does also perk me up a bit; in fact, it'll give me a reason to get out of bed: to put one on, go downstairs and brew a coffee.
my most regular 'general' sickness is migraine and with that, i'm not interested in anything but pain relief.
but, i do also wear for my skin condition as the combination of padding, DIY ointment and dampness helps bring about a resolution to a flare-up. if i'm using my ointment, i pretty much have to wear a nappy as the ointment becomes more effective with dampness and it ruins most clothing.