What this measures
How far your overnight skin temperature sat from your own recent overnight baseline, as a signed difference. It is a difference and never an absolute temperature, so there is no number here to compare with a thermometer.
How your device works it out
Your device reads skin temperature at the wrist or finger through the night and compares it with a baseline it built from your own previous nights. The baseline belongs to the provider, takes a couple of weeks to settle, and is why the screen shows nothing until it has.
What generally moves it
Room temperature, bedding, alcohol, a hot bath before bed, hormonal cycles, and how tightly the device sat against your skin.
Why Thriverence shows it
It is context beside the other overnight inputs. A night away from your own baseline is worth seeing next to your sleep and heart-rate variability, which is the only place this product asks you to read it.
What it is not
This is not a fever reading and it is not taken at your core. It does not detect infection or illness, it is not used to diagnose anything, and a deviation is not a finding about your body. If you feel unwell, a thermometer and the resources below are the right places to go.