Correct? Incorrect? (1)

1. Night cramp is something from which a great many people occasionally suffer.
2. They don't easily forgets them.
3. Even the healthiest people may get a sharp pains in the legs after a strenuous days.
4. Many old people can bring it on by making powerful stretching movements.
5. They make those movements while lying down in bed.
6. If this sort of night cramp becomes a real nuisance, people should avoid over-stretching.
7. Taking tablet containing quinine sulphate at bedtime may be all that is needs.
8. Some patients who take quinine get buzzing in the ears.
9. They may have to decided whether they would rather have cramp and no dizziness.
10. Cramp in the lower limbs in the daytime can be very distressing.