In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

nEWS rELEASE 
  
 Penn Medicine Research Reveals Suicides Are Far More Likely to Occur After Midnight 
  
 PHILADELPHIA — A new study by researchers at Penn Medicine is the first to reveal that suicides are far more likely to occur between midnight and 4 a.m. than during the daytime or evening. The research abstract was published recently in an online supplement of the journal Sleep and will be presented at SLEEP 2014, the 28th annual meeting of the Associated Professional Sleep Societies LLC. 
  
 “This appears to be the first data to suggest that circadian factors may contribute to suicidality and help explain why insomnia is also a risk factor for suicidal ideation and behavior,” said principal investigator Michael Perlis, PhD, associate professor in the Department of Psychiatry and Director of the Penn Behavioral Sleep Medicine Program at Penn. “These results suggest that not only are nightmares and insomnia significant risk factors for suicidal ideation and behavior, but just being awake at night may in and of itself be a risk factor for suicide,” he said. 
  
 For the study, the researchers analyzed data from National Violent Death Reporting System, which provided data for the estimated time of fatal injury, and the American Time Use Survey, which provided an hourly proportion of the American population that is awake. A total of 35,332 suicides were included in the analysis. 
  
 Results show that the weighted, scaled mean suicide rate per hour was 10.27 percent after midnight, peaking at 16.27 percent between 2 a.m. and 2:59 a.m. In contrast, the mean suicide rate per hour was 2.13 percent between 6 a.m. and 11:59 p.m. When six-hour time blocks were examined, the observed frequency of suicide between midnight and 5:59 a.m. was 3.6 times higher than expected. 
  
 According to the authors, previous research suggesting that more suicides occur during the day failed to account for the proportion of the population that is awake at each given hour. Perlis notes that an important implication of the study is that the treatment of insomnia may be one way to reduce suicide risk. 
  
 Other Penn authors on the study include: Michael A. Grandner, PhD, Gregory K. Brown, PhD, Mathias Basner, MD, PhD, MSc, Subhajit Chakravorty, MD, Knashawn H. Morales, ScD Michael E. Thase, MD, David F. Dinges, PhD, Phillip R. Gehrman, PhD, and Ninad S. Chaudhary. 
  
 For more information, please see the AASM press release. ||||| Treating chronic insomnia may help reduce risk, researchers add 
  
 (*this news item will not be available after 09/01/2014) 
  
 By Mary Elizabeth Dallas 
  
 Related MedlinePlus Pages Insomnia 
  
 Suicide 
  
 TUESDAY, June 3, 2014 (HealthDay News) -- Suicides are more likely to occur during the dark hours between midnight and sunrise, a new study shows. 
  
 The researchers said their findings have important implications for people with chronic insomnia that lasts for at least three months. This sleep disorder affects about 10 percent of adults. Treating insomnia may help lower suicide risk, the study authors said. 
  
 "This appears to be the first data to suggest that circadian factors may contribute to suicidality and help explain why insomnia is also a risk factor for suicidal ideation and behavior," lead investigator Michael Perlis, director of the Penn Behavioral Sleep Medicine Program at the University of Pennsylvania in Philadelphia, said in a news release. 
  
 "These results suggest that not only are nightmares and insomnia significant risk factors for suicidal ideation and behavior, but just being awake at night may in and of itself be a risk factor for suicide," he said. 
  
 Although previous studies have found that suicides occur more often during the day, the researchers pointed out these studies didn't adjust for the proportion of people awake at certain times of the day. 
  
 Using the National Violent Death Reporting System, the researchers were able to analyze the estimated times of suicides. They also obtained information on the proportion of Americans awake at any given hour from the American Time Use Survey. 
  
 The times that suicides occurred were divided into one-hour groups, weighted by the proportion of people awake at that time. 
  
 After analyzing information on more than 35,000 suicides, the researchers found the frequency of suicides between midnight and 5:59 a.m. was 3.6 times higher than expected. 
  
 The study revealed the mean suicide rate was 10.27 percent per hour after midnight. It peaked between 2 a.m. and 3 a.m., at 16.27 percent. Throughout the day, the mean suicide rate per hour was 2.13 percent. 
  
 The study was published in an online supplement of Sleep, and was to be presented Tuesday at the Associated Professional Sleep Societies annual meeting in Minneapolis. The findings should be considered preliminary until published in a peer-reviewed journal. 
  
 More than 38,000 people die by suicide each year, making it the 10th leading cause of death in the United States. |||||
People are more likely to commit suicide after midnight, and the suicide rate peaks between 2am and 3am, according to a new study. Using data from the American Time Use Survey, which calculates the proportion of Americans who are awake at any given hour, as well as the National Violent Death Reporting System, which provides data for time of fatal injury, researchers categorized more than 35,000 suicides by the hour in which they happened. While the weighted, scaled mean suicide rate is 2% between 6am and midnight, it jumps to 10% between midnight and 4am and peaks at 16% between 2am and 3am. “This appears to be the first data to suggest that circadian factors may contribute to suicidality and help explain why insomnia is also a risk factor," the lead investigator tells Penn Medicine. "Just being awake at night may in and of itself be a risk factor for suicide," he continues. Previous research has found that more suicides occur during the day, but those numbers didn't account for how many people are actually awake at any given hour. Since such a higher percentage of people who are up commit suicide in the wee hours, researchers say that treating insomnia could help lower the risk of suicide, which at 38,000 deaths per year is the 10th highest cause of death in the US, according to Medline Plus.