Is Consistent Sleep Schedule good for mood & stress?

The evidence is still emerging, so it's too early to say for certain. Evidence specific to fixed bed and wake times draws mainly on a randomized sleep-education trial in college students and observational research on circadian misalignment's effects on cortisol and inflammation, alongside broader reviews of circadian sleep-wake phase disorders. That's reflected in an evidence score of 36/100 for its role in mood & stress, drawn from 5 studies (1 RCT), with an estimated impact on longevity rated moderate (45/100).