Well, I find I need more sleep when I am training too, so I just tend to socialise less at peak training/racing times. The two gaps between tri/row season and ski season are when I get out more.

A couple of questions: are you periodising your training so that you get a rest week every three/four weeks?

Have you had your iron levels checked? Anaemia is not uncommon amongst female athletes and it's easy enough to test for and correct.