Oddly Wired
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morality

You make more ethical decisions in the morning.

A 2014 study found that people are more likely to behave dishonestly as the day progresses.

The 'morning morality effect' occurs because your cognitive resources for self-regulation deplete throughout the workday. By the afternoon, the mental effort required to resist an unethical but tempting choice becomes harder to sustain. Your moral compass is influenced by your circadian energy cycle.

Your integrity might be tied to your sleep cycle.

Where this comes from

Study
Kouchaki and Smith, 2014, Psychological Science
What the check found
The cited study exists and supports the claim, though the theoretical mechanism (ego depletion) is currently subject to significant scientific debate regarding its replicability.
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.