Changes in nights spent at tourist accommodation establishments by NUTS 2 level (2004, 2014). Positive values indicate increse on nights spent over the period. A night spent (or overnight stay) is each night a guest / tourist (resident or non-resident) actually spends (sleeps or stays) in a tourist accommodation establishment or non-rented accommodation. Overnight stays are calculated by country of residence of the guest and by month. Normally the date of arrival is different from the date of departure but persons arriving after midnight and leaving on the same day are included in overnight stays. A person should not be registered in two or more accommodation establishments at the same time. A person is considered to be a resident in a country (place) if the person: - has lived for most of the past year or 12 months in that country (place), or - has lived in that country (place) for a shorter period and intends to return within 12 months to live in that country (place). International tourists should be classified according to their country of residence, not according to their citizenship. From a tourism standpoint any person who moves to another country (place) and intends to stay there for more than one year is immediately assimilated with other residents of that country (place). Citizens residing abroad who return to their country of citizenship on a temporary visit are included with non-resident visitors. Citizenship is indicated in the person's passport (or other identification document), while country of residence has to be determined by means of question or inferred e.g. from the person's address.