Keep the conversation brief: explain that you slept poorly, describe the work effect you notice, and ask for one specific, temporary adjustment. If fatigue could make a safety-sensitive task unsafe, raise that concern promptly and follow your workplace’s reporting procedure.
What to say
Use three parts: brief context, concrete impact, and a specific request. You do not need to turn a difficult morning into a long explanation.
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“I had a very poor night’s sleep and I’m finding it harder to concentrate this morning. Could we confirm the top priorities and move the non-urgent report to tomorrow? I’ll flag you if I don’t feel safe doing any task.”
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Adapt the wording to what you are actually experiencing. Fatigue can affect attention or concentration, short-term memory, reaction time, and judgment, but people vary and the effects of one poor night are not the same for everyone. CDC/NIOSH’s Fatigue and Work guidance describes these potential effects.
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Make a practical, temporary request
Ask for a change that addresses the work impact you have identified. These are options to discuss, not guaranteed accommodations or entitlements:
- Ask which tasks are essential to complete today.
- Ask whether a non-urgent deadline can move.
- Ask whether a critical task can be checked by a colleague or manager.
Be clear about the time frame—such as this morning or today—and agree on what will happen next. If your manager cannot make the change you requested, ask which work should take priority instead.
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If fatigue could make a task unsafe
Do not treat a safety concern as an ordinary scheduling preference. If you feel too fatigued to safely drive, operate machinery, provide patient care, or perform another safety-sensitive task, say so promptly and use your employer’s reporting process. NIOSH’s guidance for nurses, managers, and other healthcare workers specifically advises healthcare workers to report to a manager when they are too fatigued to work; that example is specific to healthcare.
For other roles, follow the applicable workplace procedure rather than assuming the same policy applies. NIOSH’s Sleep and Work guidance discusses how sleep deprivation and work fatigue can affect performance, along with strategies for workers and employers.
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How much personal information to share
For a one-off conversation, focus on your present ability to do the work and what you are asking to change. You can keep the explanation simple; this advice does not establish what information you are legally required to disclose. Privacy, leave, accommodation, and reporting rules vary by jurisdiction and workplace policy, so consult the relevant policy or appropriate workplace contact if you need to understand those rules.
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If this is recurring, tell your manager about the pattern and its effect on your work, rather than presenting every difficult morning as an isolated event. Consider appropriate health support if you are concerned about your sleep. Workplace conversations can address priorities and safety, but they cannot determine the cause of ongoing sleep problems.
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