Sleeping socks are always useful. Under these you can wear another pair of socks to hide your toes or wear them in this way if you need to warm up your feet but let your toes to breath a bit cooler air.
(No, these ballerina ankles are definately not mine...
...they belong to LittleLady.)
This fabulous Sleepy Kit is also my Second Knitting Challenge for the year 2014 which was about learning to knit cables.