Truck Driver Sleep Compliance Calculator
Plan your HOS-compliant driving windows, mandatory rest periods, and sleep strategy based on FMCSA Hours of Service regulations. Stay legal and stay safe.
Truck and highway representing HOS compliance and driver fatigue management · Photo: Unsplash
FMCSA Hours of Service — Key Rules (2026)
Property carriers (standard CMV operators): 11-hour driving limit in a 14-hour on-duty window, following 10 consecutive hours off duty. 30-minute rest break required after 8 cumulative hours of driving. 60/70-hour limit in 7/8 consecutive days (depends on carrier schedule). 34-hour restart option to reset the weekly clock (must include two 1–5 AM periods).
Sleeper berth provision: Drivers with a sleeper berth may split the required 10-hour off-duty period into two periods — as long as one is at least 7 consecutive hours in the sleeper berth and the other is at least 2 consecutive hours (in the berth or off-duty). Neither period counts against the 14-hour window.
The Fatigue Science Behind HOS Rules
FMCSA HOS rules are grounded in sleep science research on drowsy driving — a leading cause of large truck crashes. Research from NHTSA indicates drowsiness is a factor in approximately 40% of heavy truck crashes. The 14-hour window rule specifically addresses cumulative fatigue regardless of driving hours — because even if a driver hasn't driven much, being on duty for 14+ hours impairs judgment through time-awake effects independent of driving load.
FMCSA Hours of Service Rules
The Federal Motor Carrier Safety Administration (FMCSA) Hours of Service (HOS) regulations exist because drowsy driving is a leading cause of large truck crashes. The primary rules for property-carrying CMV drivers: maximum 11 hours of driving after 10 consecutive hours off duty; mandatory 30-minute break after 8 hours of driving time; 60/70 hours on duty in 7/8 consecutive days (the "weekly reset" requires a 34-hour restart including two periods from 1-5 AM); and the "sleeper berth" provisions that allow split rest periods under specific conditions.
Beyond regulatory compliance, research on commercial driver fatigue is unambiguous: truck drivers are among the most sleep-restricted occupational groups, with surveys showing a significant proportion regularly sleeping under 6 hours on work nights. NHTSA data indicates driver fatigue is a factor in approximately 13% of large truck crashes annually. The HOS rules set a minimum compliance standard -- optimal driver safety requires treating them as a floor, not a target.
Sleep Quality in the Cab
Sleeping in a truck sleeper berth presents unique challenges: engine idling noise (70-80 dB) disrupts sleep if HVAC or APU is running, vibration from passing trucks, parking lot lighting, and the physiological arousal of being in a work environment rather than a dedicated sleep space. Evidence-based cab sleep improvements: high-quality ear plugs or active noise cancellation (earplugs alone reduce perceived noise by 25-33 dB), a quality eye mask or reflective blackout shade system, a consistent pre-sleep routine that signals "now it's sleep time" rather than transitioning directly from driving to sleep, and strategic parking (truck stops oriented away from main lanes and lighting structures when possible). Use our Shift Work Calculator for planning sleep windows within HOS compliance.