Do sorcery points made from converted spell slots vanish after a long rest?

Sorcerers are able to turn sorcery points into spell slots, but the same conversion rate applies to turn spell slots into sorcery points. If, by the end of the day, you have unused spell slots and you wanted to risk the overnight ambush, could you turn them into sorcery points to be used the next day? Or would they disappear anyway? Sorcery points are replenished after a long rest, but that only infers to ones that have been expended, and ones created by spell slots are theoretically one-use, so do they disappear daily or can they stack?