Fighter jets roared in the skies above Sanaa from 9 pm (1800 GMT) until around dawn, an AFP correspondent reported.
The Saudi-led coalition has vowed to keep up the raids until the rebels abandon their insurrection against President Abedrabbo Mansour Hadi, who has fled to Riyadh.
Positions held by the Iranian-backed Huthi rebels and soldiers of the renegade Republican Guard overlooking the presidential palace were believed to have been targeted overnight.
A Republican Guard camp in south Sanaa was also hit, witnesses said.
In the area around Marib, 140 kilometres east of Sanaa, radar facilities and surface-to-air missile batteries were targeted, local officials said.
In western Yemen, anti-aircraft defences were targeted in the port city of Hodeida, as well as several military positions farther south along the coast, residents said.
