Seedlings

Hard to tell without a picture. If stem is pale and long, it fell over due to its own weight and weak structure. In that case you'd want to give a bit more light earlier next time to avoid as well as slowly adjusting upward right now. don't over do it. It's something that needs to escalate based on how the plant grows. if the soil was extra wet the entire time, this can cause a weak stem and bactrieral infection that can cause 'damping off.' This will be a visible issue. It'll be slimy at base in an obvious way. A simple prosthetic of any kind can be helpful. I fold over some tape on a toothpick for a diy prop. Gently hold the plant where it should be, pop in the toothpick and rotate the 'flag of tape' in to support it nice and tight. If not damping off, it'll just need something to lean on until it gets stronger. I'd rather have to prop up a small percent of seedlings (should be rare) than light-stunt a seedling - A far easier course correction to slowly add more light. A good sized seedling pot will stay wet long enough that you don't have to irrigate until the tap roots have found the bottom and expanding quickly. This way you can immediately follow a wet-dry cycle, which virtually eliminates any damping off risk. While seedlings don't need a humidity cover unless it is very arid, a humidity dome before they sprout helps avoid an early irrigation. If your RH is solid, just remove the dome once it has sprouted. The prevention of evaporation will keep even a small 2,5" seedling pot 'moist enough' for germination, sprout and 2-3 days beyond after you remove the dome, which is plenty of time for the roots to dig downward and expand - by that time no worries letting top layer of substrate dry before re-irrigating.