Table 1. Time points for measures collected in the study.

Measure	Baseline (intern training)	3 months	6 months	9 months	12 months
Sleep and activity measurement
Actigraphy (~7 days)	x	x	x	x	x
Biological Measures
Pathology (fasting)	x	x	x	x	x
Stool Sample(s)	x	x			x
Self-report Measures
Height and weight	x				x
Questionnaires (see Table 2)	x	x	x	x	x
ASA24 food recall (via phone) [28]	x	x	x	x	x
Sleep diaries (7 Days)	x	x	x	x	x
NASA Task Load (7 Days) [29]	x	x	x	x	x
Qualitative Measures
Occupational trauma exposure+	x
Sleep inertia awareness+		x
Napping and sleep inertia on night shift+		x	x	x	x

Note. ASA24; Automated Self-Administered 24-hour ⁺ Semi-structured interview script provided in S3–S5 Appendices.

Interns will be provided a $30 gift card at each data collection point (maximum $150) as acknowledgement of time spent participating in the study.