Does breastfeeding drain you physically? of energy i mean?

[Caz10]

Obviously it is tiring esp in the early days when you are feeding when you really want to be sleeping!

But does it actually use up energy/resources in the same way that eg exercise would?

I'm not asking from a weight-loss point of view or anything, I'm just back at work and feeling exceptionally knackered, wondered if bf-ing would be a contributor?

I disagree with nowirehangers, exercise helps you sleep deeper when you do get a chance to do so. I exercise every day and it's increased my energy levels. But I'm no more or less knackered than I was before I started working out again.