Hello, my pup Sparrow is now 9 weeks and she sleeps and sleeps and sleeps. I also began by making the error of constantly entertaining her when awake. Also, if she was sleeping and woke I would take her out and play with her thinking she was now alert, but actually I now find that sometimes it is better to take her out then return her to her playpen with a toy or chew and she goes straight back to sleep.
We are slowly getting into a pattern. She wakes at 6am and is perky until around 9am and then she gets a bit OTT, so I pop her in her playpen and she will sleep 2-3hours. Then she wakes at dinnertime and I try to do some socialising with her (today we went to a teashop in the park and she sat on my lap), she will then sleep another 2-3 hours. In fact today she slept 2.5 hours, woke up, had tea and then got really naughty and chased the cat. I popped her back in her playpen and she has crashed out again.
I completely forgot just how much sleep a puppy needs (my older boys are 3 and 6), and even when she is awake I am now letting her quietly play with toys rather than try to over-excite her.
Must admit I have wondered on occasion what I have let myself in for!