Short Answer
It can be involved. Morning headache and jaw stiffness may relate to sleep clenching, grinding, or chewing-muscle tension.
How to think about it
Clenching or grinding during sleep can load the jaw-area and temple muscles. This may make the jaw feel heavy in the morning and overlap with temple headache or neck stiffness.
Evidence and limits for this question
What this question checks
This page uses the question "I wake up with headache and jaw stiffness. Could sleep bruxism be involved?" to organize a symptom pattern before assuming a TMJ-related cause.
What to rule out first
Urgent, organ-specific, dental, ENT, neurologic, traumatic, infectious, or breathing-related warning signs should be considered before jaw-related interpretation.
What is reviewed in clinic
Consultation details, symptom timing, jaw movement, chewing muscle tension, bite changes, previous exam results, and recurrence patterns may be reviewed together.
What not to decide from this page
Do not use this page alone to choose a diagnosis, appliance, procedure, medication, or emergency response.
Safety note
Severe morning headache with vomiting, visual symptoms, or neurologic signs should be evaluated for non-TMJ causes first.