The day is going well, you are smashing your to-do list and then the post-lunch slump hits. If you are working from home, sneaking back to bed at this point is very temping, but Huffington Post have some tips on how to beat that crash. (Spoiler, a power nap is totally an option!)
https://www.huffingtonpost.co.uk/entry/ways-to-overcome-afternoon-slump_uk_613f53c5e4b0640100a7d323