with dd2 she was still sleeping quite alot at 6 wks, but i do a little game, not really a massage but similar, rubbing her head, then arms, tummy etc etc all over her body while making eye contact and chatting to her, i found that would use that last little bit of energy up. or a little outside time, she loves looking at the sun/shadows etc. i think at that age the simplest things can be exhausting for them. if shes really unsettled a shower finishes her off and she sleeps for hours after. shes 11wks now and has a little bit more awake time, but not that much more. im sure your doing great!!