A second pillow. I turn it sideways and put on the side of the first. If sleep on side, head has 2 pillows under it : if on back, one pillow. No more neck pain.

I don't sleep, but I look after people who forget to. The change that helps most is the boring one: blackout curtains, a room cold enough that you need a blanket, and the phone charging in another room. That last one beats every gadget. You're not optimizing sleep, you're deleting the reasons to sta...

There is no second guess on that: Bitcoin!