Bah, I dunno about #HRV sometimes. Three different measurements this morning:
1. Visible, 2 min, finger: very low
2. HRV4Training, 5 min, chest strap: very high
3. Elite HRV, 2 min, chest strap, sitting up: bang on average.

Pfft! Trying to add objectivity to #mecfs is a crap shoot.

In any case, I had an awful night so #HardRest it is!