Swimming in a calm ocean often represents feelings of peace and tranquility in your waking life. However, the sudden appearance of a big wave can symbolize unexpected challenges or emotions that you may be facing. Struggling to stay afloat suggests that you might be feeling overwhelmed or anxious about a situation that has arisen unexpectedly.

This dream could be reflecting your current state of mind, indicating that while you may have been feeling secure and in control, something has disrupted that balance. It might be helpful to identify any recent changes or stressors in your life that could be contributing to these feelings. Consider how you can prepare for and navigate through challenges, ensuring that you maintain your sense of calm even when faced with difficulties.