因为昨天休息，所以我早上睡了懒觉。

因为昨天休息，所以我早上睡了懒觉。
了 always shows the time has passed. the difference between Chinese and English is that English show the time pass in [ were, was, had +v.ed, have +v. ed]. instead, Chinese most of the time using 了 showing the time pass.

在家里无所事事，所以昨天一天看我都在看中国的电视剧，用手机app来聊聊天朋友和朋友聊天。

you lost a subject in this sentence.

虽然休息一天，但是今天我还是有点困。

虽然休息一天，但是今天有点困。= even day off a day, but I feel tried today.
虽然休息一天，但今天我还是有点困。even day off a day, but I still feel tried today.

因为昨天休息，所以我早上睡了懒觉。

在家里无所事事因为无事可做，所以昨天一天看我都在看中国的电视剧，用手机app来聊聊天朋友与朋友聊天。

虽然休息了一天，但是今天还是有点困。