Delete sleep, HRV and Stress data for one day/night

I leant my watch to my partner to wear for one night sleep for curiosity it now I think it has skewed my own hrv and stress data as he has a lower heart rate than me. Can I delete one day/nights worth of data and would this remove it from any calculations?

I have the Lily 2 active and I can’t find any options to delete the data either in the garmin connect app or online website.