The curfew runs "from 10pm to 4am, and all must adhere to it for their own safety", the army said in a statement carried by the official SUNA news agency, adding that it was "doing its duty to keep them and their properties secure".
Omar Al-Bashir has ruled Sudan for nearly as long as I have been alive; yet throughout my 37 years I have heard nothing but criticism of the doom he has brought upon his country. Bashir had banned any unauthorized public gatherings and granted large powers to the police after declaring a state of emergency last month.
Escalating protests against al-Bashir's 30-year rule started in December and resulted in the killing of dozens.
He imposed curfews and declared a state of emergency.
He said Sudan's constitution was being suspended, border crossings were being shut until further notice and airspace was being closed for 24 hours.
That came after the African Union decried Bashir's military ouster, saying it was "not the appropriate response to the challenges facing Sudan and the aspirations of its people".
The protests were originally sparked by a rise in the cost of living, but demonstrators then began calling for the president to resign and his government to go. Since the protests erupted in Sudan in January, government calls have gone unanswered by protesters, who thought the government had no credibility over promised reforms or any other steps for amelioration.
At least two army tanks, one with jubilant demonstrators on top, moved through the capital.
Mr Bashir is the subject of an worldwide arrest warrant issued by the global Criminal Court (ICC), which accuses him of organising war crimes and crimes against humanity in Sudan's western Darfur region.
"The armed forces will take power with representation of the people to pave the way for Sudanese people to live in dignity", he said. But al-Bashir successfully presented himself as the leader of a new wave of "political Islam", based on an alliance between Islamists and the military.
Disney unveils new streaming service to debut in November
Disney (DIS.N) says its new streaming service, Disney +, will cost US$6.99 per month when it launches in the USA on November 12. Based on the Marvel comic books of the same, What If will be Marvel Studio's first animated series.
Mr Adawi is said to be favoured by regional neighbours at odds with Mr al-Bashir over his Islamist leanings.
Thousands of people flocked to an anti-government protest outside the defense ministry on Thursday, while huge crowds took to the streets in central Khartoum, dancing and shouting anti-Bashir slogans.
"We finally win this battle, we struggled a lot and we suffered a lot but everything (is) supposed to have an end", 45-year-old tea seller Fathia Imam told Al Jazeera at the square of the sit-in.
Sudanese human right defenders in Egypt - many of whom have been attacked by Sudanese security services since seeking refuge - also said that they won't return to Sudan unless the military hands over power to a civilian government.
Observers say although it remains unclear what the armed forces will announce, it appears as though the army has chose to support the protesters. "We insist on a civil government, and we don't support any coup".
Protesters celebrate in Khartoum, Sudan. An opposition source said on Thursday that "a number of leaders of the terrorist Muslim Brotherhood group" were being held along with Bashir, who ruled as an Islamist dictator.
Meanwhile, Sudan's feared National Intelligence and Security Service said it was freeing all the country's political prisoners, state media reported.
Bashir, a former paratrooper who seized power in a bloodless coup in 1989, has been a divisive figure who has managed his way through one internal crisis after another while withstanding attempts by the West to weaken him. He often shuffled his aides, once firing his presidential adviser after accusing him of plotting a coup in 2012, only to bring him back as intelligence chief previous year to deal with growing unrest.
Washington followed up with sanctions four years later.
Demonstrators have since Saturday been camped outside the sprawling army headquarters complex in Khartoum, which also houses Bashir's official residence and the defence ministry.