Hi Fiat, if you know you have just watered it the day before or in this case last night, then do not water yet again. Top portion maybe dry because it is more in contact with air, but inner parts may still be wet. The cacti will just hoard the water it got before in its stems and it will still be good a few more days without water. If I am really in doubt, sometimes I get a bamboo skewer and stick it in soil, or I put a big rock beside my succulent. If I pick up that rock and it still shows damp below, then soil below is still wet, so I do not water. Or if it still a really small plant, after watering I lift the container just to have a sense how it feels fully watered. When it has gone drier, that container will be much lighter, so I know I can water again.
Underwatering is not bad for these plants, overwatering kills it faster, when roots rot below. I really do not prefer watering at night, but it is your choice. Sometimes with these cacti and succulents, the hardest thing to do is to give them the gentle neglect it needs.
