Believers are assured that the fasts of those who use eye-drops and receive injections are not nullified! As for those who suffer from asthma, using their inhalers will also not nullify their fast, according to a fatwa in Singapore, but not necessarily everywhere else.
But this last question just floored me.
Q: What about the fast of someone who sleeps the entire day from dawn to sunset (the length of the fast)?"
A: The fast is valid because sleep is not considered to be a loss of sanity.
Unless you work the night shift, I have serious doubts about the sanity of fasting by sleeping!