Recently got the Westone 4R for this purpose. But while they're comfortable normally, they still put a sharp pressure on my outer ear when I lay my head sideways on my pillow. Seems I just need a smaller IEM. Right now, I'm looking at the ATH-CK10. They're extremely small and there's almost nothing hanging out when inserted deeply as seen in this review:
The problem is that they seem to be very hard to come by these days. Any ideas?