Quoting ♥Heather W♥:" <blockquote><b>Quoting i ♥ nora:</b>" Is he too warm? DD gets them when she over-heats ... [snip!] ... at night (its been getting down to.40-50 degrees outside). They have a fan the runs in their room to circulate the air too."
Heat rises, so youre just circulating warm air. Maybe 70 is too high for him, maybe try 68 for a night or two and keep him in just a sleep-and-play pajama?
this explains a bit better why temperature affects our sleep. if nothing is working, what harm could one night of temperature adjustment do to see if it helps your LO?