One of my favourite ways to go to sleep is to listen to my MP3 player, especially audio books about space. Also the radio 4 program "In Our Time" has some good MP3 downloads of past episodes, the ones about space or general science discussions are very good for mental distraction.

Alternatively find some long cosmology videos on YouTube and record the audio.

From a meditation point of view, the big picture, likely infinite universes, do mean that on that scale our existence is insignificant, there is some comfort to be had from that. But on the other hand without conscious life the universe has no meaning. So as well as being made from star dust we give the universe the ability to reflect on itself. Not bad for an insignificant ape descendent.

Personally I tend to overthink things and live too much in my head. Getting outside and smelling the flowers and seeing the beauty and even making bubbles in the garden is recommended.

Thank you, that seems rather unique amongst the animal world.

Presumably this behaviour could only evolve relatively recently, possibly with Homo Erectus or later.

Why do human babies cry so loudly, surely this would attract predators?