When if comes residency time, be clear in your interviewing in sizing up the program.... only you know your true limitations, factor them in and don't select a program with a malignant reputation... if you know the effect this would have on your health, etc... I know I don't require a heck of a lot of sleep and love to stay up at night(still don't know how I'm going to react to those 5:30am mornings!!) but I chose surgery and have matched in a program which fits my life style,, (I hope),,, on the other hand doesn't hurt to challenge yourself, you may be surprised, if you liked what you are doing, time flies and sleep may seem like a waste of time.
Now catching all those colds from everyone is another matter... stay away from people that sneeze a lot. Watch all those virus, bacteria coming your way. Hide in the Lounge!!!