Lights Out Early
In bed an hour earlier than usual, five nights running.
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Why this one
The least exciting challenge here and probably the one with the largest effect.
The rule
In bed an hour earlier than usual, five nights running. For 5 days. That is the whole thing; there is nothing to sign up for and nobody is tracking you.
Post the card on day one so somebody knows you started. That
is the only accountability mechanism that reliably works and it is free.