It only seems to work for a very short period of time which leads to either eating (if you have food) or drinking lots of water (if you have little/tightly rationed food).
Using water as a food substitute isn't very healthy though so after about a week with tight rations you start sleeping longer and feeling lightheaded. Either way don't worry Sanae, Reimu is probably just resting.
I seeee.
So it's already New Year's.I did eat something recently. When was it already?I want to eat riceEh.That means...
Reimu?I've somehow managed to sleep by drinking water.Reimu-san?...Huh?
Reimu?Oh right, it was just around Christmas, I guess...Are you just going to let the time pass!?Reimu-san!
Come baaccckkkk!You haven't been eating since then?*Funeral Bells*