Fruit is generally a healthy choice, and dieticians recommend you have some with every meal. But citrus in particular could be disturbing your slumber because it is highly acidic. That can lead to heartburn or painful gastrointestinal reflux disease.
Citrus fruit is also high in sugar, which can give you a boost of energy when you least need it. Eat citrus in the morning with breakfast, and switch to lower-sugar, lower-acid fruits as the day progresses. Good late-day fruits include figs, raisins, grapes, apples, kiwi, and papaya.