I need alarm because I need to keep my sleep schedule in strict time frame.<p>I often wake up at 5:30 because I slept very well at night. But I stay in bed and waiting for alarm.<p>If I didn&#x27;t sleep very well, I could wake up at 6:30, but my alarm triggers at 6:00 and I wake up at 6:01.<p>In the beginning of my experiments with sleep, I tried to use natural wake up. But my sleep schedule started floating a lot and sleep quality degraded when offset become big.<p>So I decided to keep strict sleep schedule. It&#x27;s very balanced. If one night my sleep quality wasn&#x27;t very good, then next night it&#x27;s guaranteed that I have good sleep quality. But alarm clock guaranteed that I don&#x27;t oversleep.<p>I found &quot;sleep restriction&quot; for the first time here (look at &quot;case illustration&quot; on page 3):<p><a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3060715&#x2F;pdf&#x2F;nihms-279100.pdf" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pmc&#x2F;articles&#x2F;PMC3060715&#x2F;pdf&#x2F;nihm...</a><p>After I just read another articles which I found by keywords &quot;sleep restriction&quot;.<p>It also contains very useful ideas about mindfulness meditation.<p>I wrote about it in another comment:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10564930" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10564930</a>