Do you regularly feel sleepy in the day? Do you sleep well at night? Do you get sick very often or have any chronic health complaint?
Overcoming Illness during change of Season
You have likely noticed how when some "bug" is going around, some catch it and some just don't. Your own resistance to getting sick may have to do with how you answer the above questions. Relaxation...and sleep...are a repairative state. Getting sick is also a reparative state.