1) Check that all supplies are present and correct. Coat with fur. Taste floss.
2) Settle comfortably. Stare until attention is directed back at you.
3) When bored, nod off adorably to hint that it's bedtime.
4) If the hint isn't taken and stitching continues, be more obvious.
5) If stitching persists, fake exhaustion. This should cause the stitching lamp to be turned off and everybody can go to bed.