Can consuming caffeine after a nap improve productivity, alertness and safety?

Phase 4

Recruiting

• Conditions: Shiftwork; Sleep inertia; Sleep deprivation; Other - Research that is not of generic health relevance and not applicable to specific health categories listed above

• Registration Number: ACTRN12617001486314
• Lead Sponsor: Assoc Prof Siobhan Banks

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2017-10-20
• Last Update Posted: 28 October 2019

Recruitment & Eligibility

• Status: Recruiting
• Sex: All
• Target Recruitment: 12

Inclusion Criteria

BMI between 18.5-29 kg/m2
Habitual bedtime between 2100h and 2400h
Habitual wake time between 0600h and 0900h
Less than 2 hours of structured high impact activity per week
Currently taking a contraceptive pill or experiencing regular menstrual cycles (females)
Valid driver’s licence or sufficient driving experience

Exclusion Criteria

History of smoking, drug, or alcohol abuse in the past year
History of psychiatric illness or sleep disorders such as insomnia and sleep apnoea
Food allergies
Trans-meridian travel in the 30 days prior to the study commencing
Clinically significant abnormalities in blood and urine
Shiftwork
Habitual napping
Caffeine intake exceeding 400mg per day on average
Score <22 or >44 on the Composite Morningness Questionnaire
Score >14 on the Beck Depression Index
Score >5 on the Pittsburgh Sleep Quality Index
History of cardiovascular disease
History of a neurological disorder
Pulmonary disease requiring daily inhaler use
Kidney disease
Liver disease
History of psychiatric disorder requiring hospitalisation or psychiatric product for any length of time
Positive urine pregnancy result
Resting blood pressure above 140/90
Resting pulse >110

Study & Design

• Study Type: Interventional
• Study Design: Not specified