She was feeling a little groggy when I saw her.

我看见她时，她正感觉到有一点头晕脑胀。

《柯林斯英汉双解大词典》

I advise keeping the nap between 15 and 30 minutes as you want to avoid getting into deeper stages of sleep. If you do, you'll find it harder to wake and may experience the groggy feeling for a while.

我建议小睡时间保持在15—30分钟之间避免进入深度睡眠，一旦你进入深度睡眠，你会发现很难醒过来，而且醒来之后会有段时间脑袋昏昏沉沉。

youdao

She’d had an operation for hemorrhoids the day before, so I guess she was still a bit groggy.

婚礼的前一天她做了痔疮手术，所以我猜她的身体仍然会有些虚弱。

youdao

Saints were forced into a change after 30 minutes, with Lynch replacing Hugh Murray, who appeared groggy after a clash of heads.

BBC: Sport - Football - Dundee United 1-2 St Mirren

Reina also tipped a Rosicky strike just over the bar but Arsenal were frustrated by the fortitude of a Liverpool side showing the type of character and combativeness they hoped would secure a notable win - even with a groggy Daniel Agger struggling after being hit by a ball in the face.

BBC: Liverpool 1-1 Arsenal

White House physician Connie Mariano remembers warning a groggy president in the recovery room.

CNN: A Trimmer President Clinton