Nothing could keep us indoors, not even the gloomy and depressing thoughts that had kept us so ______ the night before.

A．Staying up late.
B．Taking a hot bath.
C．Having late meals.
D．Traveling between time zones.

A．people should go to a doctor and have their problems diagnosed
B．people should exercise immediately before going to bed every night
C．people should sacrifice other things to get enough sleep if necessary.
D．People should give up going to bed and going up at the same every day.