Is it okay if I switch an Invisalign tray one night early?

remember , for tray what matters is total duration of tray in the mouth. normally 300 hrs of wearing of tray can express full movements , means 300/20 = 15 or 300/23=13 so if u wear that tray for20 hrs per day then for 15 days and if 23 hrs then 13 days.

You should follow the recommendations of the dentist or orthodontist who is treating you. They know what works best in their hands when treating their cases.  Have you called them to ask this question?  You should do this before changing any sooner than they recommended.

Thank you for posting your question. When to switch to the next Invisalign tray is upto your treating dentist.  Talk to your dentist about switching your tray a day early.  Are you trying to finish the treatment sooner?  Is there a special event that you want to finish it earlier for? Let your dentist know so you can be guided to what to do.       

Yes, it is absolutely okay to change your aligner one night earlier as long as you have worn it enough hours for the time you had to and as long as you don't make it to a habit of changing others earlier every time.