In this issue of Sleep Medicine Clinics, guest editors Keith Aguilera and Agnes Remulla bring their considerable expertise to the topic of Causes of Sleep Complaints. Their team at St. Luke's Sleep Medicine and Research Center is skilled in the diagnosis and treatment of all types of sleep disorders in patients of all ages. In this issue, experts share their knowledge on insomnia; sleep disturbances related to genetic disorders, COPD, heart failure, obesity, and dementia; sleep health and road safety, and more. Contains 13 relevant, practice-oriented topics including disrupted sleep during a pandemic; sleep disturbances during shift work; sleep disturbances in pregnancy; snoring: evaluation and management; sleep complaints among school children; and more.  Provides in-depth clinical reviews on causes of sleep complaints, offering actionable insights for clinical practice.  Presents the latest information on this timely, focused topic under the leadership of experienced editors in the field. Authors synthesize and distill the latest research and practice guidelines to create clinically significant, topic-based reviews.