Post vacation blues (or just vacation blues) or less commonly, post travel depression (PTD) is a type of mood that persons returning home from a long trip (usually a vacation) may experience.
A person may suffer from post vacation blues after returning home or to a normal routine from a long vacation, especially if it was a pleasurable one. The longer a trip lasts, the more intense the post vacation blues may be. This is because the person would be longing for their travel experiences. Post vacation blues may result in tiredness, loss of appetite, strong feelings of nostalgia, and in some cases, depression. Jet lag may intensify the post vacation blues.
In general, post vacation blues wear off after time. It usually takes a few days for the mood to wear off, although in some cases, it can take up to 1.5 times the length of the trip. Other ways of treating post vacation blues are for the person to share their experiences with family and friends, or to look at photo and souvenirs.
- Monday blues - may be experienced by persons after weekends.
- Post holiday blues - sometimes experienced by persons after long breaks. 
- Post party blues - may be experienced by persons after an enjoyable party or nightlife experience.
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