David Cramer left the following comment here:
Since you started posting these, I’ve been taking D3 in the mornings and notice that I wake up much more easily. I started with just 400 IU, then increased it to 800 IU. One day I took 1200 IU and woke up at 4:00 AM the next day. I’ve gone back to 800 IU since 4:00 AM seems a bit early. For the past week, I’ve also been giving one of my daughters (11 years old) 400 IU each morning, and she seems easier to wake up in the morning (normally it’s quite difficult.
I asked him for details.
Tell me about yourself.
I’m in my 40s and live in Austin, Texas and have two daughters. I first encountered your work when I read about the SLD in Levitt and Dubner’s blog. I read the pdf of your papers linked from that blog post and tried the SLD with sugar water. At the time, I was at the high end of my ideal weight, but was not motivated by weight as much as curiosity. I found the irony and absurdity of the SLD appealing. I also liked the idea that it could be tested easily and cheaply. I went from ~170 to ~145 lb in couple of months, but really only did SLD for ~3 weeks. I now occasionally have a nose clipped green smoothie in the morning.
How long have you been taking D3 in the morning? What time do you take it?
I started a couple of weeks ago after you started blogging about it. I take it around 7:00 AM. That would normally be about an hours after I wake up.
The most obvious change since you started taking it is that you wake up more easily? How soon did this start after you started the D3?
Yes, that’s the change I notice. It may be improving my sleep quality, but that’s very subjective and not something I track closely anyway. The effect started almost immediately.
Could you describe (a) how easy it was to wake up in the month before you started the D3 and (b) how easy it was to wake up after you started the D3?
I would often set three alarms on my cell phone and return to bed formore sleep after dismissing the first two. After D3, I usually wake up before my alarm and don’t feel the need to go back to sleep (e.g. after going to the bathroom). Post-D3, when I wake up, I’m awake. Previously, I was still very drowsy for some time, even after getting up.
What time do you usually wake up? get out of bed? do you use an alarm clock to wake yourself in the morning?
Usually 6 or 6:30. Occasionally a little earlier if I have an early meeting at work.
Did D3 have any effect on how easily you fall asleep in the evening? On how often you wake up in the middle of the night?
I haven’t noticed any difference in falling asleep. I don’t typically wake up in the middle of the night.
How much sunlight do you get on a typical morning?
Although I live in Texas, I doubt I get much in the morning this time of year. I do bike to work a couple of times a week, but my arms and legs would be covered. I might even wear gloves if it’s cold. I work inside in an office during the day.
What brand of D3 do you use? what form (e.g., gelcap)?
How can you tell your daughter “seems to find it easier to wake up in the morning”?
She’s a sound sleeper. Normally it requires repeated reminders and threats to get her up. Even after you get her out of bed, she’ll fall back asleep on the couch. With 400 IU, I’m noticing less of that. I plan to up to 800 IU this week to see if there’s a difference.