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Archive for the ‘Sleep’ Category

Day/night switch on Full Sleep chart

Friday, February 3rd, 2006

There’s a new link on the Full Sleep chart that lets you toggle back and forth between the daytime view and the overnight view. All it’s really doing is shifting the position of your data by 18 hours. The daytime view (the normal view) runs from midnight to midnight (00:00-23:59). The overnight view runs from 6pm to 6pm of the following day (18:00-18:00). This allows you to look at your overnight sleep as a visually unbroken span.

This new overnight view may be preferable to some users, but I want to point out that TT still bases all its calculations on calendar days (except of course for the overnight sleep time calculation). The reason I mention that TT uses calendar days is because the overnight calculation spans two calendar days. If *either* calendar day is marked as ‘ignore’, then TT can not calculate an overnight sleep time.

Day/night toggle

What this means is that one ‘ignored’ day in the daytime view shows up as two ignored days on the overnight view. Two consecutive ignored days in the daytime view shows up three consecutive ignored days in the overnight view and so forth. Basically, if you use the ‘ignore’ feature you will always have more ignored days in the night view than the daytime view.

Sleep Probability Chart

Monday, November 28th, 2005

The Sleep Probability chart uses a gray scale to display the probability of your child being asleep at a certain time of day for the selected dates. Areas of high contrast (black and white) mean your child is on a predictable schedule. Areas of low contrast (light, middle and dark gray) mean a less regular schedule. A uniformly gray chart would mean a completely random sleep schedule.

Sleep Probability Chart for a Newborn (birth to 1 month)

Sleep Probability chart for an individual child (1st month)

6 Months Old

Sleep Probability chart for an individual child (6 months old)

12 Months Old

Sleep Probability chart for an individual child (12 months old)

Essentially, this chart shows your child’s sleep schedule by compressing daily sleep charts into one image. This kind of compression is extremely good at showing how patterns form and evolve over time. For example, it can help you identify the average bedtime or realize that your child is transitioning from 3 naps/day to 2 naps/day.

The number of gray scale values depends on the number of days in your chart. If you have two days in your chart, then there will be three colors: black, 50% gray and white. The reason is that the different possibilities for being asleep at a given time for the two days would be:
2/2 (100% – asleep both days at a given time),
1/2 (50% – asleep one day, not the other at a given time) and
0/2 (0% – asleep neither day at a given time)

The more days in your sample, the more possible gray scale values. So if you have a months worth of data (31 days max), there will be 32 shades of gray:
(0/31 through 31/31). This would be approximately 0% black, 3% black, 6% black, 10% black, etc…

(What? You’re not tracking yet? It’s easy to create these cool charts for your baby. Discover Trixie Tracker and sign up for the Free Trial today.)

Related links: this chart was first seen on the Trixie Update in March 2004.

Sleep Scatterplot

Wednesday, October 26th, 2005

The scatter plot shows a distribution of sleep and awake entries. It’s very good at showing patterns that aren’t evident in the regular day-to-day sleep chart.

  1. The chart shows 30 days of data, which are divided into three color groups. Plots in the most recent 10 days are solid. Plots in the middle 10 days are faded a little bit, and the oldest plots are faded even more. This lets you compare recent patterns to older patterns on the same chart.
  2. Horizontal patterns in your chart indicate consistency in the length of a nap (or awake entry).
  3. Vertical patterns indicate consistency in the schedule of naps (or awake entries). The example below contains a vertical column of plots around 8:00pm. This indicates a very successful, consistent 8:00pm bedtime. It also shows that the child usually sleeps through the night — but not always.
    Scatterplot with vertical trend

  4. ‘Clumped’ patterns indicate consistency in the schedule and length of naps (or awake entries).

Side Note:
This chart is modeled after a sleep analysis story posted on The Trixie Update a while back.

Please note: The middle section titled “Analysis of Patterns and Developing Trends” was done by hand. I don’t have the smarts to write code that can analyze patterns and create a chart like that. Eventually I will hire someone with a math or computer science background and put that person in charge of creating pattern algorithms, but that’s down the road.