Baby Ferret, 11 weeks old

Question
My ferret 'Kris' lays down sometimes on the floor out of nowhere, is this fatigue or illness? she is exploring and running around just find but isnt as playful today like any other day.

Answer
If it happens quite a lot we actually have a name for it "flat ferret" and it seems to happen.  A ferret will be playing around and suddenly stop and lay down for a moment.  Then they get back up again.
If the behavior comes out of nowhere and you are noticing a change in behavior, try a trip to the vet.  At 11 weeks she is close to needed her next round of shots anyway and this is a good time to have her checked-out.