Sometimes you have to learn to draw the line. Stressed-out people often can't assert themselves. Then they have even more to do. Give your boss a choice . Say 'I'd really like to take this on, but I can't do that without giving up something else.
Most bosses can take the hint.
The same strategy works at home, with your spouse, children, relatives and friends. If you have trouble saying no, start small. Tell your hubby to make his own sandwich. Or tell your daughter to find another ride home from volleyball practice. Pad your schedule Realize that nearly everything will take longer than you anticipate.