Do your kids go off to school feeling calm and confident? Or are they upset and grumpy?

My friend, however, somehow always ran into grumpy people, encountered conflicts, and wound up in fights.

Personality: As someone who has personally experienced this debilitating loss of sleep, I can safely say that on the days when I lose a lot of sleep, I am a very grumpy and unapproachable individual.

Twice after our meetings he has sent me text messages, apologising for sounding grumpy.

Be realistic - there will be tensions between people, irritable and moody people will probably have their moments.