Slow diaphragmatic breathing
Humming
Singing
Gargling with water
Chanting
Cold face immersion
Splashing cold water on the face
Meditation
Mindfulness practice
Yoga
Gentle neck massage
Ear massage
Acupuncture
Vagus nerve stimulation devices prescribed by a clinician
Regular exercise
Adequate...
Breathe slowly and exhale longer than you inhale
Practice diaphragmatic breathing
Use grounding techniques
Get regular sleep
Keep a consistent sleep schedule
Eat regular balanced meals
Stay hydrated
Reduce caffeine and...