Wearing a new Invisalign tray only at night to keep gaps tight?

Gaps in molars closed while waiting for more refinements! So my Dr. took attachments out & wants me to wear the new tray only at night to keep the gaps tight, but this hurt!! I don't think I should wear it during the day w/o attachments (& teeth need to settle after 3 yrs of trays); wearing it only at night means it would hurt for a while...how will the teeth settle if I'm wearing an actual Invisalign at night? Also concerned that last used tray (which holds teeth fine) is maintaining the gaps!

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