We co-sleep (me, my DW, DD who is 7.5 months and our dog) in a queen sized bed. Our DD shares a comforter and sheet with us and sleeps pressed up against me for most of the night.
I think the baby may be too hot at night and that may be contributing to our sleep issues. For the first few months she slept in her diaper and a muslin swaddling blanket (in a very lose burrito wrap with her arms free). We then thought that she might be getting cool on her shoulders, so we started putting her in a sleeper. Sometimes a footed onesie with long sleeves or a short sleeved no leg onesie. Whether we're sleeping with her, sitting in bed beside her, or have left her alone, her head seems to soak the sheet and her jammies are damp.
The room is 19-20 degrees (66-68 in fahrenheit), there's a fan blowing and the window is open a crack (it's cold here now at night). Even at this moment she's sleeping on my lap and her forehead is cool while her hair and back of her onesie is lightly sweaty.









