Sleep Diary

The following examples have been included for personal use as an optional tool to assist individuals in monitoring sleep and fatigue:

Date I went to bed at: I got out of bed at: I slept for a total of (hours): My sleep quality was (use SQ scale below) When I woke up I felt (use KSS below)

Day 1


Day 2


Day 3


Day 4


Day 5


Day 6


Day 7

Weekly Total          
Daily Average          

Sleep Quality (SQ)

Figur Sleep Quality (SQ)


Self-monitoring through fatigue and sleepiness ratings

The Karolinska Sleepiness Scale (KSS)

Figur Karolinska Sleepiness Scale (KSS)This scale asks people to rate how sleepy they feel right now. Any of the values from 1 to 9 can be ticked, not only those with a verbal description.

The Samn-Perelli Crew Status Check

Figur Samn-Perelli Crew Status CheckThis scale asks people to rate their level of fatigue right now, and is a simplified version of the Samn-Perelli Checklist.

Fatigue Self-Assessment Tool

This tool supports the seafarer in the identification of fatigue with an easy-to-use one minute self-assessment. This can be used individually or during handover.
for Duty
Do you believe you are fit for duty?
1 No
2 Yes, with additional risk controls
3 Yes


Current Fatigue
How do you feel right now?
1 Very fatigued, having difficulty staying alert
2 A bit tired, effort required to stay alert
3 Very alert – wide awake



Did you sleep in the last 24 hours?
1 No
2 Yes, but I did not get my ideal amount of sleep
3 Yes, I got at least my ideal amount of sleep 
How would you rate the quality of that sleep?
1 Poor
2 Average
3 Good


Signs of
Have you experienced any physical signs of fatigue immediately before or during this duty period
i.e. microsleeps)?
1 Yes 3 No
Have you experienced any mental signs of fatigue immediately before or during this duty period
(i.e. difficulty concentrating)?
1 Yes 3 No

 Adapted from @Integrated Safety Support,

How to use this tool

With respect to the above questions, the number of the answers indicates the Fatigue Category and the action(s) required in the next table.

  • If one or more answer is 1, your Fatigue Category is 1.
  • If one or more answer is 2, your Fatigue Category is 2.
  • Otherwise, if your answers are 3, your Fatigue Category is 3.
Action Required
1 As soon as it is safe to do so, suspend any safety critical tasks that have been started. Report now to your immediate supervisor or master.
2 Before commencing your duty period or assigned tasks, or before continuing work on a task that has been started, report to your immediate supervisor or master and implement fatigue risk controls as required.
3 Monitor for signs of fatigue; no additional risk controls required.