Question 1

How is Drosophila sleep defined?

Accepted Answer

In Drosophila research, sleep is operationally defined as 5 or more consecutive minutes of inactivity (zero or near-zero beam breaks/activity counts). This definition was established by Shaw et al. (2000) and Hendricks et al. (2000) and correlates with increased arousal threshold, characteristic posture, and rapid reversibility — the hallmarks of sleep across species. The 5-minute threshold distinguishes genuine sleep from brief rest pauses.

Question 2

What input formats does this tool accept?

Accepted Answer

The tool accepts any CSV with activity time-series data. It auto-detects Zantiks multiwell plate format (Time column + well columns like A1, B2), long-format CSVs with Animal/ID, Time, and Activity columns, and generic formats. Activity can be beam-break counts, distance moved, or speed — any numeric measure of locomotion. Timestamps should be in seconds. (Zantiks is a trademark of Zantiks Ltd. This tool is independent and not affiliated with Zantiks Ltd.)

Question 3

What is an actogram?

Accepted Answer

An actogram is the standard visualization in circadian biology showing activity patterns over multiple days. Activity (or sleep) is plotted as a function of time-of-day (x-axis) across consecutive days (y-axis). The sleep profile (30-minute bins) shows the average sleep amount at each time of day, revealing circadian consolidation of sleep and wake. This tool generates both per-fly actograms and group-averaged sleep profiles.

Question 4

What is a sleep bout?

Accepted Answer

A sleep bout is a single continuous episode of sleep. Bout number and mean bout duration are key metrics: a fly with many short bouts has fragmented sleep, while a fly with few long bouts has consolidated sleep. Sleep fragmentation is a hallmark of aging, clock gene mutations, and neurodegeneration models. The tool reports bout count, mean duration, and the longest bout for each fly.

Question 5

How do I set the circadian light/dark phases?

Accepted Answer

Set the lights-on and lights-off times (ZT0 and ZT12 by default for a standard 12:12 LD cycle). The tool will split sleep metrics into daytime sleep and nighttime sleep. Drosophila are diurnal — wild-type flies consolidate sleep at night with a mid-day siesta. Clock mutants show disrupted day/night sleep distribution.

Question 6

Can I compare treatment groups?

Accepted Answer

Yes. Assign flies to groups via a group column in your CSV, or use the treatment map to assign well IDs to groups after upload. The tool computes per-group means $\pm$ SEM for all metrics and displays group comparison bar charts. Useful for comparing genotypes, drug treatments, or environmental conditions.

Drosophila Sleep Converter

Sleep Classification Settings

Drosophila Sleep — Background

Circadian Sleep Analysis

Frequently Asked Questions

Next Steps

Drosophila Activity Monitors

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