Feeling tired even after adequate sleep can be a sign of iron, magnesium, other or potassium deficiency. 

Low zinc levels impair sleep quality, making it harder to fall asleep or causing frequent nighttime awakenings.

It contributes to the production of melatonin, a hormone crucial for sleep-wake cycles, which influences neurotransmitters like serotonin + GABA, which are also involved in sleep modulation.

Thinning, brittle, or easily broken hair and nails could be a sign of zinc, selenium, or iron deficiency. Pale skin can be a symptom of iron deficiency, which can lead to anemia. 

Twitches, muscle cramps, spasms or "feeling weak" can be down to low potassium, magnesium or calcium

Increased irritability, anxiety, or even depression can be linked to deficiencies in various minerals. Memory problems, difficulty concentrating, or confusion can be associated with deficiencies in iron, B12 and others- cover all bases.