Solarized has never worked for me, but gruvbox looks interesting. It looks like it's reducing the blue light from the screen, which might help with sleep problems. It looks a bit like my normal theme after f.lux[1] starts in the evening. (Normally I switch between tender[2] and louver[3].)

[1] https://justgetflux.com/

[2] https://github.com/jacoborus/tender.vim

[3] http://jstap.web.fc2.com/louver.html