Table 2.

Post-trial questionnaire responses.

Question	Strongly agree/agree	Ambivalent		Disagree/strongly agree
The trial was well organised	21	3		0
Communication was good	24	0		0
Taking part was not too onerous	19	4		1
There were too many tasks	3	3		18
There were too many blood samples	8	8		8
There were too many questionnaires	1	5		17
Taking part inconvenienced me	1	5		13
I had side effects from taking part	1	3		20
I would take melatonin if it was available	11	12		1
I think I know if I had melatonin or placebo first	YES 11		NO 13