Related by context. Frequent words. (Click for all words.) 77 sleepiness 62 irritability 62 drowsy 62 dizziness 62 sleeplessness 60 nausea 58 insomnia 58 tiredness 58 hallucinations 57 daytime sleepiness 56 nausea vomiting 56 vomiting 55 disorientation 54 hypoglycemia 54 sleep disturbances 54 fluid retention 54 muscle cramps 53 vomiting diarrhea 53 constipation 52 blurred vision 52 lightheadedness 52 sleep disorders 52 wakefulness 52 slurred speech 52 alertness 51 motion sickness 51 body aches 51 muscle aches 51 numbness 50 nausea vomiting diarrhea 50 somnolence 50 fatigue 49 hypotension 49 falling asleep 49 eyestrain 49 melatonin 49 abdominal pain 49 migraines 49 caffeine 49 antihistamines 49 blurry vision 48 acid reflux 48 forgetfulness 48 breathlessness 48 fever headache 48 stomach aches 48 palpitations 47 Benadryl 47 narcolepsy 47 difficulty swallowing 47 stuffy nose 47 difficulty breathing 47 ADHD symptoms 47 mood swings 47 decongestants 47 symptoms 47 nasal congestion 47 snoring 47 skin rash 46 sleep apnea 46 allergic reactions 46 Sleep deprivation 46 inattentiveness 46 rapid heartbeat 46 include fever headache 46 shortness 46 Provigil 46 sleep deprivation 45 stomachache 45 antihistamine 45 hyperglycemia 45 skin irritation 45 hyperactivity 45 sleeping pill 45 jet lag 45 migraine headaches 45 fainting 45 stomach cramps 45 Sleep apnea 45 Ambien 45 liver toxicity 45 sleep 45 abdominal cramps 45 muscle spasms 45 anti depressant 45 decongestant 45 tingling 45 diarrhea 45 seasickness 45 allergy symptoms 44 heartburn 44 backache 44 Adderall 44 hot flushes 44 persistent cough 44 apnea 44 depressant 44 heart palpitations 44 epileptic seizures 44 benzodiazepine 44 skin rashes