My son's sleep patterns have been very strange these past few weeks. Never the longest straight sleeper to begin with, (he still has to log in a full 8hour stretch at 21 months and counting) he was already clocking 6 followed by 3-4 hour night-time stretches and 3 hour naps with a fantastic schedule of 10pm-8am and 1-4pm or so. This allowed my husband and I to go out on a number of dinner dates with friends, provided I was home in time to put Little A to bed. For a while, we resumed what was almost a normal couple's life.
But then our son started waking up after the 6-7 hour stretch, sometimes at 4 or 5am, and not going back to sleep for another 2-4 hours. This meant a second nap in the late afternoon and an active toddler running around the flat til midnight or 1 am. Not only that, he would alternate - one night sleeping just 7 hours (in 2-3 hour stretches) and the next, 11 or 12. The naps were constant at 2-3 hours long, but the time he would go down for one depended on what time he'd woken up earlier in the day. Sigh.
Strangest of all, Little A seems to enjoy sleeping sitting up. This may be due to having slept in his stroller, which has no recline position but must be comfy enough nonetheless as he's had marathon naps in it, and the car seat. Some nights, he prefers to fall asleep sitting up, or shifts into this position from lying down. Curiouser and curiouser.
We've put down the schedule adjustments to a couple of factors - his back bottom teeth are coming in at last and perhaps he's had another growth spurt. Hopefully things go back to normal soon, and he finally starts sleeping through the night. I'm keeping my fingers crossed as I can't remember the last time I had a full night's sleep.