Living in the Jaw for the last almost year my best 1k investment has been buying a good mattress with casper, who I also have one back at home.
Not to stan them, but in general, I don't care who you are, buying a mattress even if it's more expensive is always worth it's weight in gold. Few things in life compare to a good nights sleep, you have to do it right or else you are hurting your body, and therefore your mind, and thus the quality of your life.