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Table 1 A version modified for infants[4] of the Torsvall-Ã…kerstedt Diurnal type scale[11]

From: The relationship between consumption of tyrosine and phenylalanine as precursors of catecholamine at breakfast and the circadian typology and mental health in Japanese infants aged 2 to 5 years

Questions

Answers on a four-point scale

 

4

3

2

1

1. When would your child prefer to wake up (provided your child has a full day’s play of 8 h) if your child were totally free to arrange his (her) time?

Before 6:30 a.m.

6:30 to 7:29 a.m.

7:30 to 8:29 a.m.

8:30 a.m. or later

2. When would your child prefer to go to bed (provided your child has a full day’s play of 8 h) if your child were totally free to arrange his (her) time?

Before 9:00 p.m.

9:00 to 9:59 p.m.

10:00 to 10:59 p.m.

11:00 p.m.

3. If your child always had to go to bed at 9:00 p.m., how easy would it be to fall asleep?

Easy: would fall asleep almost instantly

Somewhat easy: would lie awake for a short time

Somewhat difficult: would lie awake for some time

Very difficult: would lie awake for a long time

4. If your child always had to wake up at 6:00 a.m., how easy would it be to wake up?

Easy: no problem at all

A little unpleasant but no big problem

Somewhat difficult and unpleasant

Very difficult and unpleasant

5. When does your child usually begin to feel the first signs of tiredness and need for sleep?

Before 9:00 p.m.

9:00 to 9:59 p.m.

10:00 to 10:59 p.m.

11:00 p.m. or later

6. How long does it usually take before your child feels fully awake in the morning after waking up?

1 to 10 min

11 to 20 min

21 to 40 min

more than 40 min

7. Please indicate to what extent your child is a morning or evening person.

Pronounced morning person (morning alert and evening tired)

Somewhat morning person

Somewhat evening person (morning tired and evening alert)

Pronounced evening person