Oddly Wired
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emotion

Nostalgia actually makes you feel physically warmer.

A 2012 study found that participants induced to feel nostalgic reported significantly higher perceived ambient temperatures.

Nostalgia serves as a psychological resource to combat loneliness and cold, activating neural pathways associated with comfort. The brain uses these memories to simulate a sense of security when the environment feels harsh.

You are using the past to regulate your current physical comfort.

Where this comes from

Study
Zhou et al., 2012, Emotion
What the check found
The study 'Heartwarming memories: Nostalgia maintains physiological comfort' by Zhou et al. (2012) in the journal 'Emotion' confirms the reported findings.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.