A man and woman asleep inside a home in Melbourne's north-west have been woken by the sound of gunfire after a number of shots were fired into the property overnight.

Police say the pair was sleeping inside the house on Yellow Box Street in Maidstone when the shooting occurred about 11.35pm on Sunday night.

Police are investigating after shots were allegedly fired into a house in Maidstone. Credit:Nine News

Police remain at the scene. Credit:Sam Cucchiara/Nine News

Several rounds hit the exterior of the home and almost 20 shells were found in the yard and in neighbouring parkland, ABC News reports.