Table A2.

Cluster compositions of original ideas and mean importance ratings of children in group 2 (N = 5), including the assignment of original ideas to main ideas.

Clusters	Original Ideas	Idea nr. 1	Merged to Main Idea 2	Mean 3
1. Being afraid				3.0
	Watching a scary movie before bedtime	1	Watching/reading something scary	3.0
	Nightmares	2	Nightmares	3.2
	Stuff in my room that looks scary when I am in bed	21	Scared by something in the bedroom	2.2
	Doing something I find scary at daytime	26	Recent scary event	3.6
2. Stressful and exciting thoughts and feelings, and illness				2.9
	Thinking about something scary when I am in bed	7	Scary thoughts	3.2
	In my bed, thinking about bad events that I experienced in the past	11	Recent stressful event	2.6
	Going to do something stressful the next day	12	Upcoming stressful event	3.0
	Going to do something exciting the next day	13	Excitement	3.0
	Feeling sad when I am in bed	16	Negative affective state	2.8
	Thinking about something sad when I am in bed	17	Negative affective state	2.8
	Being ill	18	Illness	3.4
	Feeling pain	19	Pain	3.0
	Feeling guilty about something I did that day	27	Negative affective state	3.0
	In my bed, thinking about something I experienced that day during sports	28	Recent stressful event	2.4
	Being angry about something that I find unfair	30	Negative affective state	3.0
3. Light in the bedroom				2.4
	A bedroom that is too light	3	Too much light	3.0
	A bedroom that is too dark	4	Too dark	1.8
4. Noise and distractions in the bedroom				2.8
	Loud noise from the neighbours when I am in bed	5	Noise outside	3.0
	Loud noise from outside when I am in bed	6	Noise outside	4.2
	Scary sounds when I am in bed	8	Noise outside	2.8
	Sleeping together in a bedroom with my brother/sister who makes sounds	9	Distraction in the bedroom	1.8
	A brother or sister that keeps me awake	14	Distraction in the bedroom	3.0
	Hearing the sound from the TV when my parents are watching TV and I am in bed	22	Noise inside	2.2
5. Fear	Being home alone and afraid that my parents/brother/sister do not come home	15	Scary thoughts	4.0
	Being afraid that someone breaks into my home	20	Scary thoughts	4.0
	Suddenly not hearing any sounds from my parents in our home when I am in bed	23	Scary thoughts	3.6
	Being afraid that my parents are not at home	24	Scary thoughts	4.0
	Being afraid that something happens with my parents or someone else in my family	25	Scary thoughts	4.2
	Being afraid that someone will laugh at me or say something/will be unkind to me the next day	29	Scary thoughts	2.4

¹ Idea nr. = The number of the generated idea in this group. This corresponds with the numbers on the concept maps in Appendix A. ² Merged into main idea = The overall main idea to which the original idea of this group is assigned. ³ Mean = mean importance rating on a 5-point Likert scale based on the question: ‘Think about your sleep, how much does this affect your sleep?’ answered on a 5-point Likert scale from ‘does not affect at all = 1’ to ‘affects a whole lot’ = 5’. Bold values indicate ideas rated as important (with a rating ≥3.00); Cursive values indicate the overall mean rating per cluster.