Amongst other things, sleep is the time when our body goes into maintenance mode.
Our immune system ~~slightly lowers~~ [boosts the defences](https://www.sleepstation.org.uk/articles/health/sleep-and-immunity/#:~:text=Healthy%20sleep%20can%20help%20boost,improving%20antibody%20responses%20to%20vaccinations) to allow the body to repair itself. This is why your cold [feels worst at a night](https://www.intercoastalmedical.com/2016/05/27/why-do-you-feel-sicker-at-night/#:~:text=At%20night%2C%20there%20is%20less,feel%20sicker%20during%20the%20night.) [white cells are more busy fighting it], but this is also why your body heals faster.
I haven’t had the luxury of trying it, but I heard that if you feel a cold brewing, you should just get some sleep and nip it in the bud.
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