LONDON, England (CNN) -- Troubled pop star Amy Winehouse spent the night in a London hospital after suffering a reaction to a medication she was taking at home Monday night, according to her spokeswoman. 

Amy Winehouse's husband was recently jailed for 27 months. 

Tracey Miller said she could not say what medication was involved. 

A statement from University College Hospital said Winehouse had been kept in overnight for observation. 

She had a comfortable night and was released Tuesday morning, the statement said. 

London Ambulance Service said it transported the singer after being notified of "an adult female taken unwell." 

Winehouse's spokesman in London, Chris Goodman, told the British Press Association that he had not been told what was wrong with the 24-year-old singer, who is well known for her song "Rehab," describing the singer's reluctance to enter a clinic. 

The pop singer was investigated this year after a London tabloid made public a leaked home video that showed her smoking something in a glass pipe minutes after she was heard saying she had just taken six tablets of the anti-anxiety drug Valium. Police declined to file charges. 

The singer has battled drug addiction and spent about two weeks in a rehabilitation clinic in January. 

Winehouse won five Grammy awards this year -- three for "Rehab" as well as Album of the Year and Best New Artist. 

Winehouse's Grammy winning album, "Back to Black," is still a big seller, recently charting at No. 12 in the UK more than 19 months after its release. Madame Toussaud's London wax museum recently unveiled a wax statue of Winehouse alongside Madonna, Jimi Hendrix, the Beatles, Justin Timberlake, Beyonce and other musicians in the museum's "Music Zone" exhibit.  QUESTIONS:

Q1:
1. Who does the article discuss?
2. Who is at the center of the article?
3. Who does the article focus on?
Q2:
1. Where did Amy Winhouse spend Monday night?
2. Where was Amy Winehouse on Monday night?
3. Where could one have found Amy Winehouse on Monday night?
Q3:
1. What brought Amy Winehouse to the hospital?
2. Why was Amy Winehouse hospitalized?
3. Why did Amy Winehouse have to spend the night in the hospital?
Q4:
1. What medicine did Amy Winehouse take?
2. What medication did Amy Winehouse have a reaction to?
3. Amy Winehouse was hospitalized after taking what medication?
Q5:
1. When was Amy Winehouse discharged from the hospital?
2. When was Amy Winehouse able to leave the hospital?
3. At what point did it become possible for Amy Winehouse to leave the hospital?
Q6:
1. What is the title of Amy Winehouse's popular song?
2. Which Amy Winehouse track is a hit?
3. What's the name of Amy Winehouse's hit song?
Q7:
1. What does Amy Winehouse talk about in the song Rehab?
2. What is Amy Winehouse's track Rehab about?
3. What does the song Rehab describe?
Q8:
1. What did the public see this year?
2. What was unveiled to the public this year?
3. What did people get the chance to view this year?
Q9:
1. What does Amy Winehouse battle?
2. What does Amy Winehouse struggle with?
3. What is hard for Amy Winehouse?
Q10:
1. Where did Amy Winehouse spend the beginning of the year?
2. Where was Amy Winehouse at the start of the year?
3. What was Amy Winehouse's location at the beginning of the year?
Q11:
1. How long did Amy Winehouse spend in rehab?
2. What was the length of Amy Winehouse's rehab stay?
3. How much time did Amy Winehouse spend in a rehab clinic?
Q12:
1. What is a chart topper?
2. What record tops the charts?
3. What album is beating all others on the charts?
Q13:
1. What was Back to Black's rank?
2. Where was Back to Black on the charts?
3. What was Back to Black's chart position?
