Studying till late in the night will only fetch poor grades and it is high time to tailor students' class schedules to their natural biological rhythms, stress researchers. Students whose circadian rhythms were out of sync with their class schedules -- say, night owls taking early morning courses -- received lower grades due to "social jet lag," a condition in which peak alertness times are at odds with work, school or other demands.

"We found that the majority of students were being jet-lagged by their class times, which correlated very strongly with decreased academic performance," said study co-lead author Benjamin Smarr from the University of California-Berkeley.

To reach this conclusion, the team tracked the personal daily online activity profiles of nearly 15,000 college students as they logged into campus servers.

After sorting the students into "night owls," "daytime finches" and "morning larks" -- based on their activities on days they were not in class -- researchers compared their class times to their academic outcomes.

In addition to learning deficits, social jet lag has been tied to obesity and excessive alcohol and tobacco use, said the study published in the journal Scientific Reports.

"Our research indicates that if a student can structure a consistent schedule in which class days resemble non-class days, they are more likely to achieve academic success," said study co-lead author Aaron Schirmer, an associate professor of biology at Northeastern Illinois University.

Previous studies have found that older people tend to be active earlier while young adults shift to a later sleep-wake cycle during puberty.

Overall, men stay up later than women, and circadian rhythms shift with the seasons based on natural light.

Finding these patterns reflected in students' login data spurred researchers to investigate whether digital records might also reflect the biological rhythms underlying people's behaviour.

The results suggest that "rather than admonish late students to go to bed earlier, in conflict with their biological rhythms, we should work to individualise education so that learning and classes are structured to take advantage of knowing what time of day a given student will be most capable of learning," Smarr said.

"Different people really do have biologically diverse timing, so there isn't a one-time-fits-all solution for education," he added.

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Budapest/Washington: US Vice President J D Vance has said that Lebanon was never included in the ceasefire understanding with Iran, describing the confusion as a “legitimate misunderstanding”.

Speaking to reporters before departing from Hungary, Vance said, “I think the Iranians thought that the ceasefire included Lebanon and it just didn’t. We never made that promise.”

He stressed that the United States had not included Lebanon in the scope of the ceasefire at any stage.

His remarks come amid continued Israeli strikes in Lebanon, where more than 200 people were reported killed, even as ceasefire talks between Iran and the US move forward.

Vance said Israel had “offered … to check themselves a little bit in Lebanon because they want to make sure that our negotiation is successful”.

He warned that if Iran allows the situation in Lebanon to affect the negotiations, it could derail the talks.

“If Iran wants to let this negotiation fall apart in a conflict where they were getting hammered over Lebanon, which has nothing to do with them and which the United States never once said was part of the ceasefire, that’s ultimately their choice,” he said.